913181561 has 8 divisors (see below), whose sum is σ = 936751200. Its totient is φ = 889673760.

The previous prime is 913181543. The next prime is 913181587. The reversal of 913181561 is 165181319.

It is a happy number.

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

It is not a de Polignac number, because 913181561 - 2¹⁸ = 912919417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (913181161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15230 + ... + 45368.

It is an arithmetic number, because the mean of its divisors is an integer number (117093900).

Almost surely, 2^913181561 is an apocalyptic number.

It is an amenable number.

913181561 is a deficient number, since it is larger than the sum of its proper divisors (23569639).

913181561 is a wasteful number, since it uses less digits than its factorization.

913181561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30919.

The product of its digits is 6480, while the sum is 35.

The square root of 913181561 is about 30218.8941061714. The cubic root of 913181561 is about 970.1801348244.

The spelling of 913181561 in words is "nine hundred thirteen million, one hundred eighty-one thousand, five hundred sixty-one".