1331697256 has 32 divisors (see below), whose sum is σ = 2592460800. Its totient is φ = 640624320.

The previous prime is 1331697253. The next prime is 1331697259. The reversal of 1331697256 is 6527961331.

It is an interprime number because it is at equal distance from previous prime (1331697253) and next prime (1331697259).

It is not an unprimeable number, because it can be changed into a prime (1331697253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27385 + ... + 58423.

It is an arithmetic number, because the mean of its divisors is an integer number (81014400).

Almost surely, 2^1331697256 is an apocalyptic number.

It is an amenable number.

1331697256 is a deficient number, since it is larger than the sum of its proper divisors (1260763544).

1331697256 is a wasteful number, since it uses less digits than its factorization.

1331697256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31249 (or 31245 counting only the distinct ones).

The product of its digits is 204120, while the sum is 43.

The square root of 1331697256 is about 36492.4273788412. The cubic root of 1331697256 is about 1100.1920480113.

The spelling of 1331697256 in words is "one billion, three hundred thirty-one million, six hundred ninety-seven thousand, two hundred fifty-six".