261495351 has 16 divisors (see below), whose sum is σ = 417201120. Its totient is φ = 160920000.

The previous prime is 261495319. The next prime is 261495359. The reversal of 261495351 is 153594162.

261495351 is a `hidden beast` number, since 2 + 614 + 9 + 5 + 35 + 1 = 666.

It is not a de Polignac number, because 261495351 - 2⁵ = 261495319 is a prime.

It is a super-2 number, since 2×261495351² = 136759637189226402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261495359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372150 + ... + 372851.

It is an arithmetic number, because the mean of its divisors is an integer number (26075070).

Almost surely, 2^261495351 is an apocalyptic number.

261495351 is a deficient number, since it is larger than the sum of its proper divisors (155705769).

261495351 is a wasteful number, since it uses less digits than its factorization.

261495351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745023 (or 745017 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 261495351 is about 16170.8178828407. The cubic root of 261495351 is about 639.4716921043.

The spelling of 261495351 in words is "two hundred sixty-one million, four hundred ninety-five thousand, three hundred fifty-one".