157645231 has 2 divisors, whose sum is σ = 157645232. Its totient is φ = 157645230.

The previous prime is 157645219. The next prime is 157645253. The reversal of 157645231 is 132546751.

It is a weak prime.

It is an emirp because it is prime and its reverse (132546751) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157645231 is a prime.

It is a super-2 number, since 2×157645231² = 49704037714086722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157645291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78822615 + 78822616.

It is an arithmetic number, because the mean of its divisors is an integer number (78822616).

Almost surely, 2^157645231 is an apocalyptic number.

157645231 is a deficient number, since it is larger than the sum of its proper divisors (1).

157645231 is an equidigital number, since it uses as much as digits as its factorization.

157645231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 157645231 is about 12555.6852063119. The cubic root of 157645231 is about 540.2070890672.

The spelling of 157645231 in words is "one hundred fifty-seven million, six hundred forty-five thousand, two hundred thirty-one".