261216474 has 32 divisors (see below), whose sum is σ = 546182784. Its totient is φ = 83128320.

The previous prime is 261216469. The next prime is 261216479. The reversal of 261216474 is 474612162.

261216474 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261216469) and next prime (261216479).

It is not an unprimeable number, because it can be changed into a prime (261216479) 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, 86982 + ... + 89934.

It is an arithmetic number, because the mean of its divisors is an integer number (17068212).

Almost surely, 2^261216474 is an apocalyptic number.

261216474 is an abundant number, since it is smaller than the sum of its proper divisors (284966310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261216474 is a wasteful number, since it uses less digits than its factorization.

261216474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3622.

The product of its digits is 16128, while the sum is 33.

The square root of 261216474 is about 16162.1927348983. The cubic root of 261216474 is about 639.2442854092.

The spelling of 261216474 in words is "two hundred sixty-one million, two hundred sixteen thousand, four hundred seventy-four".