261830745 has 32 divisors (see below), whose sum is σ = 507795840. Its totient is φ = 126947520.

The previous prime is 261830729. The next prime is 261830761. The reversal of 261830745 is 547038162.

261830745 is a `hidden beast` number, since 2 + 618 + 30 + 7 + 4 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (261830729) and next prime (261830761).

It is not a de Polignac number, because 261830745 - 2⁴ = 261830729 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86674 + ... + 89643.

It is an arithmetic number, because the mean of its divisors is an integer number (15868620).

Almost surely, 2^261830745 is an apocalyptic number.

It is an amenable number.

261830745 is a deficient number, since it is larger than the sum of its proper divisors (245965095).

261830745 is a wasteful number, since it uses less digits than its factorization.

261830745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176342 (or 176336 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 261830745 is about 16181.1849071692. The cubic root of 261830745 is about 639.7449708171.

The spelling of 261830745 in words is "two hundred sixty-one million, eight hundred thirty thousand, seven hundred forty-five".