261402715 has 16 divisors (see below), whose sum is σ = 358778880. Its totient is φ = 179105760.

The previous prime is 261402697. The next prime is 261402721. The reversal of 261402715 is 517204162.

It is not a de Polignac number, because 261402715 - 2²⁷ = 127184987 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62046 + ... + 66124.

It is an arithmetic number, because the mean of its divisors is an integer number (22423680).

Almost surely, 2^261402715 is an apocalyptic number.

261402715 is a deficient number, since it is larger than the sum of its proper divisors (97376165).

261402715 is a wasteful number, since it uses less digits than its factorization.

261402715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5922.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 261402715 is about 16167.9533336783. The cubic root of 261402715 is about 639.3961711999.

Adding to 261402715 its reverse (517204162), we get a palindrome (778606877).

The spelling of 261402715 in words is "two hundred sixty-one million, four hundred two thousand, seven hundred fifteen".