156639943 has 2 divisors, whose sum is σ = 156639944. Its totient is φ = 156639942.

The previous prime is 156639941. The next prime is 156639979. The reversal of 156639943 is 349936651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 156639943 - 2¹ = 156639941 is a prime.

Together with 156639941, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 156639893 and 156639902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156639941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78319971 + 78319972.

It is an arithmetic number, because the mean of its divisors is an integer number (78319972).

Almost surely, 2^156639943 is an apocalyptic number.

156639943 is a deficient number, since it is larger than the sum of its proper divisors (1).

156639943 is an equidigital number, since it uses as much as digits as its factorization.

156639943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 46.

The square root of 156639943 is about 12515.5880005695. The cubic root of 156639943 is about 539.0563572157.

The spelling of 156639943 in words is "one hundred fifty-six million, six hundred thirty-nine thousand, nine hundred forty-three".