1157157961 has 2 divisors, whose sum is σ = 1157157962. Its totient is φ = 1157157960.

The previous prime is 1157157959. The next prime is 1157158003. The reversal of 1157157961 is 1697517511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1073545225 + 83612736 = 32765^2 + 9144^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157157961 - 2¹ = 1157157959 is a prime.

Together with 1157157959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1157157901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578578980 + 578578981.

It is an arithmetic number, because the mean of its divisors is an integer number (578578981).

Almost surely, 2^1157157961 is an apocalyptic number.

It is an amenable number.

1157157961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157157961 is an equidigital number, since it uses as much as digits as its factorization.

1157157961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66150, while the sum is 43.

The square root of 1157157961 is about 34017.0245759384. The cubic root of 1157157961 is about 1049.8587749592.

The spelling of 1157157961 in words is "one billion, one hundred fifty-seven million, one hundred fifty-seven thousand, nine hundred sixty-one".