1157212161 has 12 divisors (see below), whose sum is σ = 1910318592. Its totient is φ = 661264056.

The previous prime is 1157212139. The next prime is 1157212163. The reversal of 1157212161 is 1612127511.

1157212161 is a `hidden beast` number, since 11 + 572 + 1 + 21 + 61 = 666.

It is not a de Polignac number, because 1157212161 - 2⁷ = 1157212033 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1157212163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9184161 + ... + 9184286.

It is an arithmetic number, because the mean of its divisors is an integer number (159193216).

Almost surely, 2^1157212161 is an apocalyptic number.

It is an amenable number.

1157212161 is a deficient number, since it is larger than the sum of its proper divisors (753106431).

1157212161 is a wasteful number, since it uses less digits than its factorization.

1157212161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18368460 (or 18368457 counting only the distinct ones).

The product of its digits is 840, while the sum is 27.

The square root of 1157212161 is about 34017.8212265277. The cubic root of 1157212161 is about 1049.8751661115.

Adding to 1157212161 its reverse (1612127511), we get a palindrome (2769339672).

The spelling of 1157212161 in words is "one billion, one hundred fifty-seven million, two hundred twelve thousand, one hundred sixty-one".