521890157 has 16 divisors (see below), whose sum is σ = 584029440. Its totient is φ = 463454208.

The previous prime is 521890121. The next prime is 521890163. The reversal of 521890157 is 751098125.

It is a cyclic number.

It is not a de Polignac number, because 521890157 - 2¹² = 521886061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521890157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521890357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79868 + ... + 86154.

It is an arithmetic number, because the mean of its divisors is an integer number (36501840).

Almost surely, 2^521890157 is an apocalyptic number.

It is an amenable number.

521890157 is a deficient number, since it is larger than the sum of its proper divisors (62139283).

521890157 is a wasteful number, since it uses less digits than its factorization.

521890157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6580.

The product of its (nonzero) digits is 25200, while the sum is 38.

The square root of 521890157 is about 22844.9153423689. The cubic root of 521890157 is about 805.1183072652.

The spelling of 521890157 in words is "five hundred twenty-one million, eight hundred ninety thousand, one hundred fifty-seven".