1131520997 has 2 divisors, whose sum is σ = 1131520998. Its totient is φ = 1131520996.

The previous prime is 1131520981. The next prime is 1131521047. The reversal of 1131520997 is 7990251311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664917796 + 466603201 = 25786^2 + 21601^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131520997 - 2⁴ = 1131520981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131520997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131520937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565760498 + 565760499.

It is an arithmetic number, because the mean of its divisors is an integer number (565760499).

Almost surely, 2^1131520997 is an apocalyptic number.

It is an amenable number.

1131520997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131520997 is an equidigital number, since it uses as much as digits as its factorization.

1131520997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 1131520997 is about 33638.0884861194. The cubic root of 1131520997 is about 1042.0475554327.

The spelling of 1131520997 in words is "one billion, one hundred thirty-one million, five hundred twenty thousand, nine hundred ninety-seven".