155236561 has 8 divisors (see below), whose sum is σ = 160448000. Its totient is φ = 150037920.

The previous prime is 155236547. The next prime is 155236573. The reversal of 155236561 is 165632551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155236561 is a prime.

It is a super-2 number, since 2×155236561² = 48196779742213442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155236541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25765 + ... + 31213.

It is an arithmetic number, because the mean of its divisors is an integer number (20056000).

Almost surely, 2^155236561 is an apocalyptic number.

It is an amenable number.

155236561 is a deficient number, since it is larger than the sum of its proper divisors (5211439).

155236561 is an equidigital number, since it uses as much as digits as its factorization.

155236561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6399.

The product of its digits is 27000, while the sum is 34.

The square root of 155236561 is about 12459.3964942127. The cubic root of 155236561 is about 537.4416721275.

The spelling of 155236561 in words is "one hundred fifty-five million, two hundred thirty-six thousand, five hundred sixty-one".