1161565051 has 2 divisors, whose sum is σ = 1161565052. Its totient is φ = 1161565050.

The previous prime is 1161565039. The next prime is 1161565061. The reversal of 1161565051 is 1505651611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1161565051 - 2¹⁵ = 1161532283 is a prime.

It is not a weakly prime, because it can be changed into another prime (1161565061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580782525 + 580782526.

It is an arithmetic number, because the mean of its divisors is an integer number (580782526).

Almost surely, 2^1161565051 is an apocalyptic number.

1161565051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161565051 is an equidigital number, since it uses as much as digits as its factorization.

1161565051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 31.

The square root of 1161565051 is about 34081.7407272575. The cubic root of 1161565051 is about 1051.1898985219.

The spelling of 1161565051 in words is "one billion, one hundred sixty-one million, five hundred sixty-five thousand, fifty-one".