1331969657 has 2 divisors, whose sum is σ = 1331969658. Its totient is φ = 1331969656.

The previous prime is 1331969627. The next prime is 1331969687. The reversal of 1331969657 is 7569691331.

It is a balanced prime because it is at equal distance from previous prime (1331969627) and next prime (1331969687).

It can be written as a sum of positive squares in only one way, i.e., 950118976 + 381850681 = 30824^2 + 19541^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331969657 - 2⁶ = 1331969593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331969627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665984828 + 665984829.

It is an arithmetic number, because the mean of its divisors is an integer number (665984829).

Almost surely, 2^1331969657 is an apocalyptic number.

It is an amenable number.

1331969657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331969657 is an equidigital number, since it uses as much as digits as its factorization.

1331969657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 918540, while the sum is 50.

The square root of 1331969657 is about 36496.1594828826. The cubic root of 1331969657 is about 1100.2670582988.

The spelling of 1331969657 in words is "one billion, three hundred thirty-one million, nine hundred sixty-nine thousand, six hundred fifty-seven".