157311793 has 8 divisors (see below), whose sum is σ = 161317800. Its totient is φ = 153313920.

The previous prime is 157311769. The next prime is 157311821. The reversal of 157311793 is 397113751.

It can be written as a sum of positive squares in 4 ways, for example, as 135424 + 157176369 = 368^2 + 12537^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157311793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157311703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62271 + ... + 64747.

It is an arithmetic number, because the mean of its divisors is an integer number (20164725).

Almost surely, 2^157311793 is an apocalyptic number.

It is an amenable number.

157311793 is a deficient number, since it is larger than the sum of its proper divisors (4006007).

157311793 is a wasteful number, since it uses less digits than its factorization.

157311793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4067.

The product of its digits is 19845, while the sum is 37.

The square root of 157311793 is about 12542.3998102437. The cubic root of 157311793 is about 539.8259532828.

It can be divided in two parts, 1573 and 11793, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 157311793 in words is "one hundred fifty-seven million, three hundred eleven thousand, seven hundred ninety-three".