40990161 has 4 divisors (see below), whose sum is σ = 54653552. Its totient is φ = 27326772.

The previous prime is 40990151. The next prime is 40990171. The reversal of 40990161 is 16109904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (40990151) and next prime (40990171).

It is not a de Polignac number, because 40990161 - 2⁵ = 40990129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40990121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6831691 + ... + 6831696.

It is an arithmetic number, because the mean of its divisors is an integer number (13663388).

Almost surely, 2^40990161 is an apocalyptic number.

It is an amenable number.

40990161 is a deficient number, since it is larger than the sum of its proper divisors (13663391).

40990161 is a wasteful number, since it uses less digits than its factorization.

40990161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13663390.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 40990161 is about 6402.3558945126. The cubic root of 40990161 is about 344.7941388971.

The spelling of 40990161 in words is "forty million, nine hundred ninety thousand, one hundred sixty-one".