521903542 has 4 divisors (see below), whose sum is σ = 782855316. Its totient is φ = 260951770.

The previous prime is 521903539. The next prime is 521903563. The reversal of 521903542 is 245309125.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 130475884 + ... + 130475887.

It is an arithmetic number, because the mean of its divisors is an integer number (195713829).

Almost surely, 2^521903542 is an apocalyptic number.

521903542 is a deficient number, since it is larger than the sum of its proper divisors (260951774).

521903542 is a wasteful number, since it uses less digits than its factorization.

521903542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260951773.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 521903542 is about 22845.2082940822. The cubic root of 521903542 is about 805.1251902055.

The spelling of 521903542 in words is "five hundred twenty-one million, nine hundred three thousand, five hundred forty-two".