155425561 has 2 divisors, whose sum is σ = 155425562. Its totient is φ = 155425560.

The previous prime is 155425549. The next prime is 155425573. The reversal of 155425561 is 165524551.

It is a balanced prime because it is at equal distance from previous prime (155425549) and next prime (155425573).

It can be written as a sum of positive squares in only one way, i.e., 124456336 + 30969225 = 11156^2 + 5565^2 .

It is a cyclic number.

It is not a de Polignac number, because 155425561 - 2⁷ = 155425433 is a prime.

It is equal to p_8732077 and since 155425561 and 8732077 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (155425591) 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, 77712780 + 77712781.

It is an arithmetic number, because the mean of its divisors is an integer number (77712781).

Almost surely, 2^155425561 is an apocalyptic number.

It is an amenable number.

155425561 is a deficient number, since it is larger than the sum of its proper divisors (1).

155425561 is an equidigital number, since it uses as much as digits as its factorization.

155425561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30000, while the sum is 34.

The square root of 155425561 is about 12466.9788240776. The cubic root of 155425561 is about 537.6596948240.

The spelling of 155425561 in words is "one hundred fifty-five million, four hundred twenty-five thousand, five hundred sixty-one".