7491285721 has 8 divisors (see below), whose sum is σ = 7667447040. Its totient is φ = 7315212912.

The previous prime is 7491285709. The next prime is 7491285727. The reversal of 7491285721 is 1275821947.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7491285721 - 2¹³ = 7491277529 is a prime.

It is a super-2 number, since 2×7491285721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7491285727) 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, 168120 + ... + 207958.

It is an arithmetic number, because the mean of its divisors is an integer number (958430880).

Almost surely, 2^7491285721 is an apocalyptic number.

It is an amenable number.

7491285721 is a deficient number, since it is larger than the sum of its proper divisors (176161319).

7491285721 is a wasteful number, since it uses less digits than its factorization.

7491285721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44255.

The product of its digits is 282240, while the sum is 46.

The square root of 7491285721 is about 86552.2138422814. The cubic root of 7491285721 is about 1956.6754101336.

The spelling of 7491285721 in words is "seven billion, four hundred ninety-one million, two hundred eighty-five thousand, seven hundred twenty-one".