261673401 has 16 divisors (see below), whose sum is σ = 403005888. Its totient is φ = 149260800.

The previous prime is 261673397. The next prime is 261673421. The reversal of 261673401 is 104376162.

It is not a de Polignac number, because 261673401 - 2² = 261673397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261673421) 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, 232660 + ... + 233781.

It is an arithmetic number, because the mean of its divisors is an integer number (25187868).

Almost surely, 2^261673401 is an apocalyptic number.

It is an amenable number.

261673401 is a deficient number, since it is larger than the sum of its proper divisors (141332487).

261673401 is a wasteful number, since it uses less digits than its factorization.

261673401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466472.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 261673401 is about 16176.3222334374. The cubic root of 261673401 is about 639.6167961536.

The spelling of 261673401 in words is "two hundred sixty-one million, six hundred seventy-three thousand, four hundred one".