915099661 has 4 divisors (see below), whose sum is σ = 1045828192. Its totient is φ = 784371132.

The previous prime is 915099659. The next prime is 915099667. The reversal of 915099661 is 166990519.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166990519 = 431 ⋅387449.

It is a cyclic number.

It is not a de Polignac number, because 915099661 - 2¹ = 915099659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (915099667) 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 3 ways as a sum of consecutive naturals, for example, 65364255 + ... + 65364268.

It is an arithmetic number, because the mean of its divisors is an integer number (261457048).

Almost surely, 2^915099661 is an apocalyptic number.

It is an amenable number.

915099661 is a deficient number, since it is larger than the sum of its proper divisors (130728531).

915099661 is a wasteful number, since it uses less digits than its factorization.

915099661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130728530.

The product of its (nonzero) digits is 131220, while the sum is 46.

The square root of 915099661 is about 30250.6142251690. The cubic root of 915099661 is about 970.8589341629.

It can be divided in two parts, 9150 and 99661, that added together give a triangular number (108811 = T₄₆₆).

The spelling of 915099661 in words is "nine hundred fifteen million, ninety-nine thousand, six hundred sixty-one".