155971423 has 2 divisors, whose sum is σ = 155971424. Its totient is φ = 155971422.

The previous prime is 155971357. The next prime is 155971463. The reversal of 155971423 is 324179551.

It is a strong prime.

It is an emirp because it is prime and its reverse (324179551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155971423 - 2⁹ = 155970911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155971463) 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 as a sum of consecutive naturals, namely, 77985711 + 77985712.

It is an arithmetic number, because the mean of its divisors is an integer number (77985712).

Almost surely, 2^155971423 is an apocalyptic number.

155971423 is a deficient number, since it is larger than the sum of its proper divisors (1).

155971423 is an equidigital number, since it uses as much as digits as its factorization.

155971423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 37.

The square root of 155971423 is about 12488.8519488382. The cubic root of 155971423 is about 538.2883882469.

It can be divided in two parts, 15597 and 1423, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 155971423 in words is "one hundred fifty-five million, nine hundred seventy-one thousand, four hundred twenty-three".