915006561 has 16 divisors (see below), whose sum is σ = 1398443904. Its totient is φ = 521305344.

The previous prime is 915006557. The next prime is 915006563. The reversal of 915006561 is 165600519.

It is not a de Polignac number, because 915006561 - 2² = 915006557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (915006563) 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, 57570 + ... + 71723.

It is an arithmetic number, because the mean of its divisors is an integer number (87402744).

Almost surely, 2^915006561 is an apocalyptic number.

It is an amenable number.

915006561 is a deficient number, since it is larger than the sum of its proper divisors (483437343).

915006561 is a wasteful number, since it uses less digits than its factorization.

915006561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129640.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 915006561 is about 30249.0753742986. The cubic root of 915006561 is about 970.8260087757.

The spelling of 915006561 in words is "nine hundred fifteen million, six thousand, five hundred sixty-one".