2031521656 has 16 divisors (see below), whose sum is σ = 3857320800. Its totient is φ = 1002902784.

The previous prime is 2031521647. The next prime is 2031521693. The reversal of 2031521656 is 6561251302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1606585 + ... + 1607848.

It is an arithmetic number, because the mean of its divisors is an integer number (241082550).

Almost surely, 2^2031521656 is an apocalyptic number.

It is an amenable number.

2031521656 is a deficient number, since it is larger than the sum of its proper divisors (1825799144).

2031521656 is a wasteful number, since it uses less digits than its factorization.

2031521656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214518 (or 3214514 counting only the distinct ones).

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

The square root of 2031521656 is about 45072.4045952731. The cubic root of 2031521656 is about 1266.5057098649.

Adding to 2031521656 its reverse (6561251302), we get a palindrome (8592772958).

The spelling of 2031521656 in words is "two billion, thirty-one million, five hundred twenty-one thousand, six hundred fifty-six".