155467561 has 2 divisors, whose sum is σ = 155467562. Its totient is φ = 155467560.

The previous prime is 155467553. The next prime is 155467577. The reversal of 155467561 is 165764551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138203536 + 17264025 = 11756^2 + 4155^2 .

It is a cyclic number.

It is not a de Polignac number, because 155467561 - 2³ = 155467553 is a prime.

It is not a weakly prime, because it can be changed into another prime (155467591) 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, 77733780 + 77733781.

It is an arithmetic number, because the mean of its divisors is an integer number (77733781).

Almost surely, 2^155467561 is an apocalyptic number.

It is an amenable number.

155467561 is a deficient number, since it is larger than the sum of its proper divisors (1).

155467561 is an equidigital number, since it uses as much as digits as its factorization.

155467561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126000, while the sum is 40.

The square root of 155467561 is about 12468.6631600986. The cubic root of 155467561 is about 537.7081203067.

The spelling of 155467561 in words is "one hundred fifty-five million, four hundred sixty-seven thousand, five hundred sixty-one".