1261253330 has 16 divisors (see below), whose sum is σ = 2270835864. Its totient is φ = 504372480.

The previous prime is 1261253327. The next prime is 1261253333. The reversal of 1261253330 is 333521621.

1261253330 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1261253327) and next prime (1261253333).

It can be written as a sum of positive squares in 4 ways, for example, as 484572169 + 776681161 = 22013^2 + 27869^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261253330.

It is not an unprimeable number, because it can be changed into a prime (1261253333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31784 + ... + 59436.

Almost surely, 2^1261253330 is an apocalyptic number.

1261253330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261253330 is a deficient number, since it is larger than the sum of its proper divisors (1009582534).

1261253330 is a wasteful number, since it uses less digits than its factorization.

1261253330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32221.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 1261253330 is about 35514.1285969401. The cubic root of 1261253330 is about 1080.4403011522.

Adding to 1261253330 its reverse (333521621), we get a palindrome (1594774951).

The spelling of 1261253330 in words is "one billion, two hundred sixty-one million, two hundred fifty-three thousand, three hundred thirty".