2515691 has 2 divisors, whose sum is σ = 2515692. Its totient is φ = 2515690.

The previous prime is 2515687. The next prime is 2515697. The reversal of 2515691 is 1965152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2515691 - 2² = 2515687 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2515697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1257845 + 1257846.

It is an arithmetic number, because the mean of its divisors is an integer number (1257846).

2^2515691 is an apocalyptic number.

2515691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2515691 is an equidigital number, since it uses as much as digits as its factorization.

2515691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 29.

The square root of 2515691 is about 1586.0929985344. The cubic root of 2515691 is about 136.0042350181.

The spelling of 2515691 in words is "two million, five hundred fifteen thousand, six hundred ninety-one".