405162081 has 10 divisors (see below), whose sum is σ = 605242242. Its totient is φ = 270108000.

The previous prime is 405162067. The next prime is 405162097. The reversal of 405162081 is 180261504.

It can be written as a sum of positive squares in only one way, i.e., 324000000 + 81162081 = 18000^2 + 9009^2 .

It is not a de Polignac number, because 405162081 - 2⁹ = 405161569 is a prime.

It is a super-2 number, since 2×405162081² = 328312623760501122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405162001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2500920 + ... + 2501081.

Almost surely, 2^405162081 is an apocalyptic number.

It is an amenable number.

405162081 is a deficient number, since it is larger than the sum of its proper divisors (200080161).

405162081 is an equidigital number, since it uses as much as digits as its factorization.

405162081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5002013 (or 5002004 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 405162081 is about 20128.6383295046. The cubic root of 405162081 is about 739.9623069430.

The spelling of 405162081 in words is "four hundred five million, one hundred sixty-two thousand, eighty-one".