155900881 has 2 divisors, whose sum is σ = 155900882. Its totient is φ = 155900880.

The previous prime is 155900821. The next prime is 155900971. The reversal of 155900881 is 188009551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155850256 + 50625 = 12484^2 + 225^2 .

It is an emirp because it is prime and its reverse (188009551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155900881 - 2²¹ = 153803729 is a prime.

It is a super-2 number, since 2×155900881² = 48610169393152322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155900881.

It is not a weakly prime, because it can be changed into another prime (155900821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77950440 + 77950441.

It is an arithmetic number, because the mean of its divisors is an integer number (77950441).

Almost surely, 2^155900881 is an apocalyptic number.

It is an amenable number.

155900881 is a deficient number, since it is larger than the sum of its proper divisors (1).

155900881 is an equidigital number, since it uses as much as digits as its factorization.

155900881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 155900881 is about 12486.0274306923. The cubic root of 155900881 is about 538.2072245209.

The spelling of 155900881 in words is "one hundred fifty-five million, nine hundred thousand, eight hundred eighty-one".