155387081 has 2 divisors, whose sum is σ = 155387082. Its totient is φ = 155387080.

The previous prime is 155387077. The next prime is 155387101. The reversal of 155387081 is 180783551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114682681 + 40704400 = 10709^2 + 6380^2 .

It is a cyclic number.

It is not a de Polignac number, because 155387081 - 2² = 155387077 is a prime.

It is a super-2 number, since 2×155387081² = 48290289883401122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155387381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77693540 + 77693541.

It is an arithmetic number, because the mean of its divisors is an integer number (77693541).

Almost surely, 2^155387081 is an apocalyptic number.

It is an amenable number.

155387081 is a deficient number, since it is larger than the sum of its proper divisors (1).

155387081 is an equidigital number, since it uses as much as digits as its factorization.

155387081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 38.

The square root of 155387081 is about 12465.4354516800. The cubic root of 155387081 is about 537.6153201996.

The spelling of 155387081 in words is "one hundred fifty-five million, three hundred eighty-seven thousand, eighty-one".