30731225 has 24 divisors (see below), whose sum is σ = 44217408. Its totient is φ = 20750400.

The previous prime is 30731221. The next prime is 30731231. The reversal of 30731225 is 52213703.

It is not a de Polignac number, because 30731225 - 2² = 30731221 is a prime.

It is a Duffinian number.

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 30731225.

It is not an unprimeable number, because it can be changed into a prime (30731221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10415 + ... + 13035.

It is an arithmetic number, because the mean of its divisors is an integer number (1842392).

Almost surely, 2^30731225 is an apocalyptic number.

30731225 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

30731225 is a deficient number, since it is larger than the sum of its proper divisors (13486183).

30731225 is a wasteful number, since it uses less digits than its factorization.

30731225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705 (or 2700 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 30731225 is about 5543.5751099809. The cubic root of 30731225 is about 313.2275528195.

Adding to 30731225 its reverse (52213703), we get a palindrome (82944928).

The spelling of 30731225 in words is "thirty million, seven hundred thirty-one thousand, two hundred twenty-five".