155628881 has 2 divisors, whose sum is σ = 155628882. Its totient is φ = 155628880.

The previous prime is 155628853. The next prime is 155628899. The reversal of 155628881 is 188826551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123321025 + 32307856 = 11105^2 + 5684^2 .

It is a cyclic number.

It is not a de Polignac number, because 155628881 - 2⁶ = 155628817 is a prime.

It is a super-2 number, since 2×155628881² = 48440697202624322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155628821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77814440 + 77814441.

It is an arithmetic number, because the mean of its divisors is an integer number (77814441).

Almost surely, 2^155628881 is an apocalyptic number.

It is an amenable number.

155628881 is a deficient number, since it is larger than the sum of its proper divisors (1).

155628881 is an equidigital number, since it uses as much as digits as its factorization.

155628881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153600, while the sum is 44.

The square root of 155628881 is about 12475.1305003194. The cubic root of 155628881 is about 537.8940392381.

The spelling of 155628881 in words is "one hundred fifty-five million, six hundred twenty-eight thousand, eight hundred eighty-one".