155420641 has 2 divisors, whose sum is σ = 155420642. Its totient is φ = 155420640.

The previous prime is 155420623. The next prime is 155420653. The reversal of 155420641 is 146024551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154256400 + 1164241 = 12420^2 + 1079^2 .

It is a cyclic number.

It is not a de Polignac number, because 155420641 - 2⁹ = 155420129 is a prime.

It is not a weakly prime, because it can be changed into another prime (155420621) 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, 77710320 + 77710321.

It is an arithmetic number, because the mean of its divisors is an integer number (77710321).

Almost surely, 2^155420641 is an apocalyptic number.

It is an amenable number.

155420641 is a deficient number, since it is larger than the sum of its proper divisors (1).

155420641 is an equidigital number, since it uses as much as digits as its factorization.

155420641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 155420641 is about 12466.7815012536. The cubic root of 155420641 is about 537.6540215538.

The spelling of 155420641 in words is "one hundred fifty-five million, four hundred twenty thousand, six hundred forty-one".