155313561 has 8 divisors (see below), whose sum is σ = 223014400. Its totient is φ = 95577552.

The previous prime is 155313551. The next prime is 155313563. The reversal of 155313561 is 165313551.

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

It is not a de Polignac number, because 155313561 - 2⁶ = 155313497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155313563) 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 in 7 ways as a sum of consecutive naturals, for example, 1991161 + ... + 1991238.

It is an arithmetic number, because the mean of its divisors is an integer number (27876800).

Almost surely, 2^155313561 is an apocalyptic number.

It is an amenable number.

155313561 is a deficient number, since it is larger than the sum of its proper divisors (67700839).

155313561 is a wasteful number, since it uses less digits than its factorization.

155313561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982415.

The product of its digits is 6750, while the sum is 30.

The square root of 155313561 is about 12462.4861484376. The cubic root of 155313561 is about 537.5305175390.

The spelling of 155313561 in words is "one hundred fifty-five million, three hundred thirteen thousand, five hundred sixty-one".