155872049 has 2 divisors, whose sum is σ = 155872050. Its totient is φ = 155872048.

The previous prime is 155872043. The next prime is 155872109. The reversal of 155872049 is 940278551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126787600 + 29084449 = 11260^2 + 5393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155872049 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 155871997 and 155872015.

It is not a weakly prime, because it can be changed into another prime (155872043) 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, 77936024 + 77936025.

It is an arithmetic number, because the mean of its divisors is an integer number (77936025).

Almost surely, 2^155872049 is an apocalyptic number.

It is an amenable number.

155872049 is a deficient number, since it is larger than the sum of its proper divisors (1).

155872049 is an equidigital number, since it uses as much as digits as its factorization.

155872049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 155872049 is about 12484.8728067209. The cubic root of 155872049 is about 538.1740441495.

The spelling of 155872049 in words is "one hundred fifty-five million, eight hundred seventy-two thousand, forty-nine".