261515095 has 4 divisors (see below), whose sum is σ = 313818120. Its totient is φ = 209212072.

The previous prime is 261515077. The next prime is 261515117. The reversal of 261515095 is 590515162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261515095 - 2¹⁵ = 261482327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261515095.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26151505 + ... + 26151514.

It is an arithmetic number, because the mean of its divisors is an integer number (78454530).

Almost surely, 2^261515095 is an apocalyptic number.

261515095 is a deficient number, since it is larger than the sum of its proper divisors (52303025).

261515095 is an equidigital number, since it uses as much as digits as its factorization.

261515095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52303024.

The product of its (nonzero) digits is 13500, while the sum is 34.

The square root of 261515095 is about 16171.4283537355. The cubic root of 261515095 is about 639.4877859676.

The spelling of 261515095 in words is "two hundred sixty-one million, five hundred fifteen thousand, ninety-five".