521951997 has 8 divisors (see below), whose sum is σ = 795355456. Its totient is φ = 298258272.

The previous prime is 521951977. The next prime is 521951999. The reversal of 521951997 is 799159125.

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

It is not a de Polignac number, because 521951997 - 2⁸ = 521951741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521951999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12427408 + ... + 12427449.

It is an arithmetic number, because the mean of its divisors is an integer number (99419432).

Almost surely, 2^521951997 is an apocalyptic number.

It is an amenable number.

521951997 is a deficient number, since it is larger than the sum of its proper divisors (273403459).

521951997 is a wasteful number, since it uses less digits than its factorization.

521951997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24854867.

The product of its digits is 255150, while the sum is 48.

The square root of 521951997 is about 22846.2687763232. The cubic root of 521951997 is about 805.1501061339.

The spelling of 521951997 in words is "five hundred twenty-one million, nine hundred fifty-one thousand, nine hundred ninety-seven".