261346251 has 8 divisors (see below), whose sum is σ = 348603904. Its totient is φ = 174159720.

The previous prime is 261346237. The next prime is 261346277. The reversal of 261346251 is 152643162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261346251 - 2¹⁵ = 261313483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261346201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8515 + ... + 24396.

It is an arithmetic number, because the mean of its divisors is an integer number (43575488).

Almost surely, 2^261346251 is an apocalyptic number.

261346251 is a deficient number, since it is larger than the sum of its proper divisors (87257653).

261346251 is a wasteful number, since it uses less digits than its factorization.

261346251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35561.

The product of its digits is 8640, while the sum is 30.

The square root of 261346251 is about 16166.2070690685. The cubic root of 261346251 is about 639.3501305340.

It can be divided in two parts, 26134 and 6251, that added together give a triangular number (32385 = T₂₅₄).

The spelling of 261346251 in words is "two hundred sixty-one million, three hundred forty-six thousand, two hundred fifty-one".