615491961 has 32 divisors (see below), whose sum is σ = 949321728. Its totient is φ = 347453760.

The previous prime is 615491941. The next prime is 615491963. The reversal of 615491961 is 169194516.

It is not a de Polignac number, because 615491961 - 2¹³ = 615483769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (615491963) 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 31 ways as a sum of consecutive naturals, for example, 693460 + ... + 694346.

It is an arithmetic number, because the mean of its divisors is an integer number (29666304).

Almost surely, 2^615491961 is an apocalyptic number.

It is an amenable number.

615491961 is a deficient number, since it is larger than the sum of its proper divisors (333829767).

615491961 is a wasteful number, since it uses less digits than its factorization.

615491961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261.

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

The square root of 615491961 is about 24809.1104435447. The cubic root of 615491961 is about 850.6301951684.

The spelling of 615491961 in words is "six hundred fifteen million, four hundred ninety-one thousand, nine hundred sixty-one".