40691641 has 3 divisors (see below), whose sum is σ = 40698021. Its totient is φ = 40685262.

The previous prime is 40691633. The next prime is 40691647. The reversal of 40691641 is 14619604.

The square root of 40691641 is 6379.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 40691641 - 2³ = 40691633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40691647) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3190 + ... + 9568.

It is an arithmetic number, because the mean of its divisors is an integer number (13566007).

Almost surely, 2^40691641 is an apocalyptic number.

40691641 is the 6379-th square number.

40691641 is the 3190-th centered octagonal number.

It is an amenable number.

40691641 is a deficient number, since it is larger than the sum of its proper divisors (6380).

40691641 is an frugal number, since it uses more digits than its factorization.

40691641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12758 (or 6379 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The cubic root of 40691641 is about 343.9550852888.

Multiplying 40691641 by its product of nonzero digits (5184), we get a square (210945466944 = 459288²).

The spelling of 40691641 in words is "forty million, six hundred ninety-one thousand, six hundred forty-one".