1157993639 has 4 divisors (see below), whose sum is σ = 1263265800. Its totient is φ = 1052721480.

The previous prime is 1157993633. The next prime is 1157993647. The reversal of 1157993639 is 9363997511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1157993639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157993633) 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 3 ways as a sum of consecutive naturals, for example, 52636064 + ... + 52636085.

It is an arithmetic number, because the mean of its divisors is an integer number (315816450).

Almost surely, 2^1157993639 is an apocalyptic number.

1157993639 is a deficient number, since it is larger than the sum of its proper divisors (105272161).

1157993639 is a wasteful number, since it uses less digits than its factorization.

1157993639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105272160.

The product of its digits is 1377810, while the sum is 53.

The square root of 1157993639 is about 34029.3055909168. The cubic root of 1157993639 is about 1050.1114436513. Note that the first 3 decimals are identical.

The spelling of 1157993639 in words is "one billion, one hundred fifty-seven million, nine hundred ninety-three thousand, six hundred thirty-nine".