521891942 has 96 divisors (see below), whose sum is σ = 1024565760. Its totient is φ = 196584960.

The previous prime is 521891941. The next prime is 521891963. The reversal of 521891942 is 249198125.

It is a self number, because there is not a number n which added to its sum of digits gives 521891942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521891941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1453559 + ... + 1453917.

It is an arithmetic number, because the mean of its divisors is an integer number (10672560).

Almost surely, 2^521891942 is an apocalyptic number.

521891942 is a deficient number, since it is larger than the sum of its proper divisors (502673818).

521891942 is a wasteful number, since it uses less digits than its factorization.

521891942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438 (or 425 counting only the distinct ones).

The product of its digits is 51840, while the sum is 41.

The square root of 521891942 is about 22844.9544101099. The cubic root of 521891942 is about 805.1192251688.

The spelling of 521891942 in words is "five hundred twenty-one million, eight hundred ninety-one thousand, nine hundred forty-two".