155152561 has 2 divisors, whose sum is σ = 155152562. Its totient is φ = 155152560.

The previous prime is 155152559. The next prime is 155152589. The reversal of 155152561 is 165251551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155151936 + 625 = 12456^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 155152561 - 2¹ = 155152559 is a prime.

Together with 155152559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (155152511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77576280 + 77576281.

It is an arithmetic number, because the mean of its divisors is an integer number (77576281).

Almost surely, 2^155152561 is an apocalyptic number.

It is an amenable number.

155152561 is a deficient number, since it is larger than the sum of its proper divisors (1).

155152561 is an equidigital number, since it uses as much as digits as its factorization.

155152561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7500, while the sum is 31.

The square root of 155152561 is about 12456.0250882856. The cubic root of 155152561 is about 537.3447163472.

The spelling of 155152561 in words is "one hundred fifty-five million, one hundred fifty-two thousand, five hundred sixty-one".