521402487 has 16 divisors (see below), whose sum is σ = 708595200. Its totient is φ = 340956000.

The previous prime is 521402471. The next prime is 521402489. The reversal of 521402487 is 784204125.

It is not a de Polignac number, because 521402487 - 2⁴ = 521402471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521402489) 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 15 ways as a sum of consecutive naturals, for example, 36237 + ... + 48537.

It is an arithmetic number, because the mean of its divisors is an integer number (44287200).

Almost surely, 2^521402487 is an apocalyptic number.

521402487 is a deficient number, since it is larger than the sum of its proper divisors (187192713).

521402487 is a wasteful number, since it uses less digits than its factorization.

521402487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12574.

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 521402487 is about 22834.2393567204. The cubic root of 521402487 is about 804.8674534543.

The spelling of 521402487 in words is "five hundred twenty-one million, four hundred two thousand, four hundred eighty-seven".