155525861 has 2 divisors, whose sum is σ = 155525862. Its totient is φ = 155525860.

The previous prime is 155525831. The next prime is 155525873. The reversal of 155525861 is 168525551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86136961 + 69388900 = 9281^2 + 8330^2 .

It is a cyclic number.

It is not a de Polignac number, because 155525861 - 2²⁶ = 88416997 is a prime.

It is equal to p_8737418 and since 155525861 and 8737418 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155525801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77762930 + 77762931.

It is an arithmetic number, because the mean of its divisors is an integer number (77762931).

Almost surely, 2^155525861 is an apocalyptic number.

It is an amenable number.

155525861 is a deficient number, since it is larger than the sum of its proper divisors (1).

155525861 is an equidigital number, since it uses as much as digits as its factorization.

155525861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60000, while the sum is 38.

The square root of 155525861 is about 12471.0008018603. Note that the first 3 decimals coincide. The cubic root of 155525861 is about 537.7753250352.

The spelling of 155525861 in words is "one hundred fifty-five million, five hundred twenty-five thousand, eight hundred sixty-one".