157981093 has 4 divisors (see below), whose sum is σ = 158987500. Its totient is φ = 156974688.

The previous prime is 157981079. The next prime is 157981123. The reversal of 157981093 is 390189751.

157981093 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52446564 + 105534529 = 7242^2 + 10273^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157981093 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 (157981013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502968 + ... + 503281.

It is an arithmetic number, because the mean of its divisors is an integer number (39746875).

Almost surely, 2^157981093 is an apocalyptic number.

It is an amenable number.

157981093 is a deficient number, since it is larger than the sum of its proper divisors (1006407).

157981093 is a wasteful number, since it uses less digits than its factorization.

157981093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006406.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 157981093 is about 12569.0529873973. The cubic root of 157981093 is about 540.5904526823.

The spelling of 157981093 in words is "one hundred fifty-seven million, nine hundred eighty-one thousand, ninety-three".