261694330 has 16 divisors (see below), whose sum is σ = 473110920. Its totient is φ = 104219712.

The previous prime is 261694319. The next prime is 261694339. The reversal of 261694330 is 33496162.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 257313681 + 4380649 = 16041^2 + 2093^2 .

It is not an unprimeable number, because it can be changed into a prime (261694339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54849 + ... + 59428.

Almost surely, 2^261694330 is an apocalyptic number.

261694330 is a deficient number, since it is larger than the sum of its proper divisors (211416590).

261694330 is a wasteful number, since it uses less digits than its factorization.

261694330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114513.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 261694330 is about 16176.9691227992. The cubic root of 261694330 is about 639.6338481772.

The spelling of 261694330 in words is "two hundred sixty-one million, six hundred ninety-four thousand, three hundred thirty".