405611961 has 16 divisors (see below), whose sum is σ = 551793600. Its totient is φ = 264949568.

The previous prime is 405611957. The next prime is 405611963. The reversal of 405611961 is 169116504.

It is a cyclic number.

It is not a de Polignac number, because 405611961 - 2² = 405611957 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (405611963) 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, 52495 + ... + 59723.

It is an arithmetic number, because the mean of its divisors is an integer number (34487100).

Almost surely, 2^405611961 is an apocalyptic number.

It is an amenable number.

405611961 is a deficient number, since it is larger than the sum of its proper divisors (146181639).

405611961 is a wasteful number, since it uses less digits than its factorization.

405611961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7608.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 405611961 is about 20139.8103516394. The cubic root of 405611961 is about 740.2360830623.

The spelling of 405611961 in words is "four hundred five million, six hundred eleven thousand, nine hundred sixty-one".