915491661 has 16 divisors (see below), whose sum is σ = 1398633600. Its totient is φ = 521788608.

The previous prime is 915491639. The next prime is 915491663. The reversal of 915491661 is 166194519.

915491661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 915491661 - 2¹⁰ = 915490637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (915491663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47866 + ... + 64203.

It is an arithmetic number, because the mean of its divisors is an integer number (87414600).

Almost surely, 2^915491661 is an apocalyptic number.

It is an amenable number.

915491661 is a deficient number, since it is larger than the sum of its proper divisors (483141939).

915491661 is a wasteful number, since it uses less digits than its factorization.

915491661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112468.

The product of its digits is 58320, while the sum is 42.

The square root of 915491661 is about 30257.0927387282. The cubic root of 915491661 is about 970.9975428810.

The spelling of 915491661 in words is "nine hundred fifteen million, four hundred ninety-one thousand, six hundred sixty-one".