309132157 has 4 divisors (see below), whose sum is σ = 309167740. Its totient is φ = 309096576.

The previous prime is 309132137. The next prime is 309132191. The reversal of 309132157 is 751231903.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 751231903 = 383 ⋅1961441.

It can be written as a sum of positive squares in 2 ways, for example, as 103754596 + 205377561 = 10186^2 + 14331^2 .

It is a cyclic number.

It is not a de Polignac number, because 309132157 - 2¹⁹ = 308607869 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 (309132107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4819 + ... + 25327.

It is an arithmetic number, because the mean of its divisors is an integer number (77291935).

Almost surely, 2^309132157 is an apocalyptic number.

It is an amenable number.

309132157 is a deficient number, since it is larger than the sum of its proper divisors (35583).

309132157 is a wasteful number, since it uses less digits than its factorization.

309132157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35582.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 309132157 is about 17582.1545039281. The cubic root of 309132157 is about 676.1577985847.

The spelling of 309132157 in words is "three hundred nine million, one hundred thirty-two thousand, one hundred fifty-seven".