155943971 has 2 divisors, whose sum is σ = 155943972. Its totient is φ = 155943970.

The previous prime is 155943959. The next prime is 155944007. The reversal of 155943971 is 179349551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155943971 - 2²⁶ = 88835107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155943911) 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, 77971985 + 77971986.

It is an arithmetic number, because the mean of its divisors is an integer number (77971986).

Almost surely, 2^155943971 is an apocalyptic number.

155943971 is a deficient number, since it is larger than the sum of its proper divisors (1).

155943971 is an equidigital number, since it uses as much as digits as its factorization.

155943971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 170100, while the sum is 44.

The square root of 155943971 is about 12487.7528402832. The cubic root of 155943971 is about 538.2568056241.

The spelling of 155943971 in words is "one hundred fifty-five million, nine hundred forty-three thousand, nine hundred seventy-one".