1331131157 has 2 divisors, whose sum is σ = 1331131158. Its totient is φ = 1331131156.

The previous prime is 1331131111. The next prime is 1331131169. The reversal of 1331131157 is 7511311331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881436721 + 449694436 = 29689^2 + 21206^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331131157 - 2¹⁶ = 1331065621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331131057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665565578 + 665565579.

It is an arithmetic number, because the mean of its divisors is an integer number (665565579).

Almost surely, 2^1331131157 is an apocalyptic number.

It is an amenable number.

1331131157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331131157 is an equidigital number, since it uses as much as digits as its factorization.

1331131157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 945, while the sum is 26.

The square root of 1331131157 is about 36484.6701643307. The cubic root of 1331131157 is about 1100.0361302182.

Adding to 1331131157 its reverse (7511311331), we get a palindrome (8842442488).

The spelling of 1331131157 in words is "one billion, three hundred thirty-one million, one hundred thirty-one thousand, one hundred fifty-seven".