261094251 has 24 divisors (see below), whose sum is σ = 383406912. Its totient is φ = 156738000.

The previous prime is 261094247. The next prime is 261094261. The reversal of 261094251 is 152490162.

It is not a de Polignac number, because 261094251 - 2² = 261094247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261094201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 752260 + ... + 752606.

It is an arithmetic number, because the mean of its divisors is an integer number (15975288).

Almost surely, 2^261094251 is an apocalyptic number.

261094251 is a deficient number, since it is larger than the sum of its proper divisors (122312661).

261094251 is a wasteful number, since it uses less digits than its factorization.

261094251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 261094251 is about 16158.4111533282. The cubic root of 261094251 is about 639.1445692084.

The spelling of 261094251 in words is "two hundred sixty-one million, ninety-four thousand, two hundred fifty-one".