1131361997 has 2 divisors, whose sum is σ = 1131361998. Its totient is φ = 1131361996.

The previous prime is 1131361967. The next prime is 1131362017. The reversal of 1131361997 is 7991631311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 856498756 + 274863241 = 29266^2 + 16579^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131361997 - 2¹² = 1131357901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131361967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565680998 + 565680999.

It is an arithmetic number, because the mean of its divisors is an integer number (565680999).

Almost surely, 2^1131361997 is an apocalyptic number.

It is an amenable number.

1131361997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131361997 is an equidigital number, since it uses as much as digits as its factorization.

1131361997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 41.

The square root of 1131361997 is about 33635.7250107679. The cubic root of 1131361997 is about 1041.9987440472.

The spelling of 1131361997 in words is "one billion, one hundred thirty-one million, three hundred sixty-one thousand, nine hundred ninety-seven".