157639 has 2 divisors, whose sum is σ = 157640. Its totient is φ = 157638.

The previous prime is 157637. The next prime is 157649. The reversal of 157639 is 936751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157639 - 2¹ = 157637 is a prime.

Together with 157637, it forms a pair of twin primes.

157639 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 157639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157637) 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 as a sum of consecutive naturals, namely, 78819 + 78820.

It is an arithmetic number, because the mean of its divisors is an integer number (78820).

157639 is a Friedman number, since it can be written as 175+(9*6)^3, using all its digits and the basic arithmetic operations.

2¹⁵⁷⁶³⁹ is an apocalyptic number.

157639 is a deficient number, since it is larger than the sum of its proper divisors (1).

157639 is an equidigital number, since it uses as much as digits as its factorization.

157639 is an odious number, because the sum of its binary digits is odd.

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

The square root of 157639 is about 397.0377815775. The cubic root of 157639 is about 54.0199971663.

The spelling of 157639 in words is "one hundred fifty-seven thousand, six hundred thirty-nine".