261996929 has 16 divisors (see below), whose sum is σ = 273490560. Its totient is φ = 250800000.

The previous prime is 261996901. The next prime is 261996937. The reversal of 261996929 is 929699162.

261996929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 261996929 - 2²⁰ = 260948353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261996989) 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, 625082 + ... + 625500.

It is an arithmetic number, because the mean of its divisors is an integer number (17093160).

Almost surely, 2^261996929 is an apocalyptic number.

It is an amenable number.

261996929 is a deficient number, since it is larger than the sum of its proper divisors (11493631).

261996929 is a wasteful number, since it uses less digits than its factorization.

261996929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712.

The product of its digits is 944784, while the sum is 53.

The square root of 261996929 is about 16186.3191924539. The cubic root of 261996929 is about 639.8802909242.

The spelling of 261996929 in words is "two hundred sixty-one million, nine hundred ninety-six thousand, nine hundred twenty-nine".