261942416 has 10 divisors (see below), whose sum is σ = 507513462. Its totient is φ = 130971200.

The previous prime is 261942407. The next prime is 261942431. The reversal of 261942416 is 614249162.

It can be written as a sum of positive squares in only one way, i.e., 231648400 + 30294016 = 15220^2 + 5504^2 .

It is a super-2 number, since 2×261942416² = 137227658599834112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8185685 + ... + 8185716.

Almost surely, 2^261942416 is an apocalyptic number.

It is an amenable number.

261942416 is a deficient number, since it is larger than the sum of its proper divisors (245571046).

261942416 is a wasteful number, since it uses less digits than its factorization.

261942416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16371409 (or 16371403 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 261942416 is about 16184.6351827899. The cubic root of 261942416 is about 639.8359084525.

The spelling of 261942416 in words is "two hundred sixty-one million, nine hundred forty-two thousand, four hundred sixteen".