521347995 has 128 divisors (see below), whose sum is σ = 1102080000. Its totient is φ = 236615904.

The previous prime is 521347963. The next prime is 521347997. The reversal of 521347995 is 599743125.

It is a happy number.

521347995 is a `hidden beast` number, since 521 + 34 + 7 + 9 + 95 = 666.

It is not a de Polignac number, because 521347995 - 2⁵ = 521347963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 521347995.

It is not an unprimeable number, because it can be changed into a prime (521347997) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3750636 + ... + 3750774.

It is an arithmetic number, because the mean of its divisors is an integer number (8610000).

Almost surely, 2^521347995 is an apocalyptic number.

521347995 is an abundant number, since it is smaller than the sum of its proper divisors (580732005).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521347995 is an frugal number, since it uses more digits than its factorization.

521347995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 154 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 521347995 is about 22833.0461174150. The cubic root of 521347995 is about 804.8394134619.

The spelling of 521347995 in words is "five hundred twenty-one million, three hundred forty-seven thousand, nine hundred ninety-five".