261992422 has 4 divisors (see below), whose sum is σ = 392988636. Its totient is φ = 130996210.

The previous prime is 261992413. The next prime is 261992453. The reversal of 261992422 is 224299162.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65498104 + ... + 65498107.

It is an arithmetic number, because the mean of its divisors is an integer number (98247159).

Almost surely, 2^261992422 is an apocalyptic number.

261992422 is a deficient number, since it is larger than the sum of its proper divisors (130996214).

261992422 is a wasteful number, since it uses less digits than its factorization.

261992422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130996213.

The product of its digits is 31104, while the sum is 37.

The square root of 261992422 is about 16186.1799693442. The cubic root of 261992422 is about 639.8766217247.

The spelling of 261992422 in words is "two hundred sixty-one million, nine hundred ninety-two thousand, four hundred twenty-two".