1157991337 has 8 divisors (see below), whose sum is σ = 1166560136. Its totient is φ = 1149437952.

The previous prime is 1157991319. The next prime is 1157991353. The reversal of 1157991337 is 7331997511.

It can be written as a sum of positive squares in 4 ways, for example, as 9865881 + 1148125456 = 3141^2 + 33884^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1157991337 - 2⁷ = 1157991209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1157901337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177823 + ... + 184219.

It is an arithmetic number, because the mean of its divisors is an integer number (145820017).

Almost surely, 2^1157991337 is an apocalyptic number.

It is an amenable number.

1157991337 is a deficient number, since it is larger than the sum of its proper divisors (8568799).

1157991337 is a wasteful number, since it uses less digits than its factorization.

1157991337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7707.

The product of its digits is 178605, while the sum is 46.

The square root of 1157991337 is about 34029.2717671125. The cubic root of 1157991337 is about 1050.1107478046.

The spelling of 1157991337 in words is "one billion, one hundred fifty-seven million, nine hundred ninety-one thousand, three hundred thirty-seven".