405161561 has 8 divisors (see below), whose sum is σ = 490279680. Its totient is φ = 326852928.

The previous prime is 405161503. The next prime is 405161563. The reversal of 405161561 is 165161504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405161561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405161563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1702241 + ... + 1702478.

It is an arithmetic number, because the mean of its divisors is an integer number (61284960).

Almost surely, 2^405161561 is an apocalyptic number.

It is an amenable number.

405161561 is a deficient number, since it is larger than the sum of its proper divisors (85118119).

405161561 is a wasteful number, since it uses less digits than its factorization.

405161561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3404743.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 405161561 is about 20128.6254125810. The cubic root of 405161561 is about 739.9619903779.

The spelling of 405161561 in words is "four hundred five million, one hundred sixty-one thousand, five hundred sixty-one".