261318830 has 32 divisors (see below), whose sum is σ = 488503008. Its totient is φ = 100569600.

The previous prime is 261318823. The next prime is 261318839. The reversal of 261318830 is 38813162.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261318839) 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, 25565 + ... + 34295.

It is an arithmetic number, because the mean of its divisors is an integer number (15265719).

Almost surely, 2^261318830 is an apocalyptic number.

261318830 is a deficient number, since it is larger than the sum of its proper divisors (227184178).

261318830 is a wasteful number, since it uses less digits than its factorization.

261318830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8852.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 261318830 is about 16165.3589505461. The cubic root of 261318830 is about 639.3277690971.

The spelling of 261318830 in words is "two hundred sixty-one million, three hundred eighteen thousand, eight hundred thirty".