1157201901 has 6 divisors (see below), whose sum is σ = 1671513870. Its totient is φ = 771467928.

The previous prime is 1157201893. The next prime is 1157201923. The reversal of 1157201901 is 1091027511.

1157201901 is a `hidden beast` number, since 1 + 1 + 572 + 0 + 1 + 90 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1077546276 + 79655625 = 32826^2 + 8925^2 .

It is not a de Polignac number, because 1157201901 - 2³ = 1157201893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157201971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64288986 + ... + 64289003.

It is an arithmetic number, because the mean of its divisors is an integer number (278585645).

Almost surely, 2^1157201901 is an apocalyptic number.

It is an amenable number.

1157201901 is a deficient number, since it is larger than the sum of its proper divisors (514311969).

1157201901 is a wasteful number, since it uses less digits than its factorization.

1157201901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128577995 (or 128577992 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 27.

The square root of 1157201901 is about 34017.6704228846. The cubic root of 1157201901 is about 1049.8720633238.

The spelling of 1157201901 in words is "one billion, one hundred fifty-seven million, two hundred one thousand, nine hundred one".