155575261 has 2 divisors, whose sum is σ = 155575262. Its totient is φ = 155575260.

The previous prime is 155575237. The next prime is 155575307. The reversal of 155575261 is 162575551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97891236 + 57684025 = 9894^2 + 7595^2 .

It is a cyclic number.

It is not a de Polignac number, because 155575261 - 2⁵ = 155575229 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155575261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155575201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77787630 + 77787631.

It is an arithmetic number, because the mean of its divisors is an integer number (77787631).

Almost surely, 2^155575261 is an apocalyptic number.

It is an amenable number.

155575261 is a deficient number, since it is larger than the sum of its proper divisors (1).

155575261 is an equidigital number, since it uses as much as digits as its factorization.

155575261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52500, while the sum is 37.

The square root of 155575261 is about 12472.9812394632. The cubic root of 155575261 is about 537.8322572364.

The spelling of 155575261 in words is "one hundred fifty-five million, five hundred seventy-five thousand, two hundred sixty-one".