261680234 has 4 divisors (see below), whose sum is σ = 392520354. Its totient is φ = 130840116.

The previous prime is 261680233. The next prime is 261680249. The reversal of 261680234 is 432086162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 432086162 = 2 ⋅216043081.

It can be written as a sum of positive squares in only one way, i.e., 212722225 + 48958009 = 14585^2 + 6997^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261680234.

It is not an unprimeable number, because it can be changed into a prime (261680233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65420057 + ... + 65420060.

Almost surely, 2^261680234 is an apocalyptic number.

261680234 is a deficient number, since it is larger than the sum of its proper divisors (130840120).

261680234 is a wasteful number, since it uses less digits than its factorization.

261680234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130840119.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 261680234 is about 16176.5334358137. The cubic root of 261680234 is about 639.6223634798.

The spelling of 261680234 in words is "two hundred sixty-one million, six hundred eighty thousand, two hundred thirty-four".