155772073 has 2 divisors, whose sum is σ = 155772074. Its totient is φ = 155772072.

The previous prime is 155772061. The next prime is 155772209. The reversal of 155772073 is 370277551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153834409 + 1937664 = 12403^2 + 1392^2 .

It is a cyclic number.

It is not a de Polignac number, because 155772073 - 2⁵ = 155772041 is a prime.

It is equal to p_8750476 and since 155772073 and 8750476 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (155772373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77886036 + 77886037.

It is an arithmetic number, because the mean of its divisors is an integer number (77886037).

Almost surely, 2^155772073 is an apocalyptic number.

It is an amenable number.

155772073 is a deficient number, since it is larger than the sum of its proper divisors (1).

155772073 is an equidigital number, since it uses as much as digits as its factorization.

155772073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51450, while the sum is 37.

The square root of 155772073 is about 12480.8682790902. The cubic root of 155772073 is about 538.0589583125.

The spelling of 155772073 in words is "one hundred fifty-five million, seven hundred seventy-two thousand, seventy-three".