40591651 has 4 divisors (see below), whose sum is σ = 40818600. Its totient is φ = 40364704.

The previous prime is 40591643. The next prime is 40591667. The reversal of 40591651 is 15619504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40591651 - 2³ = 40591643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40591601) 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, 113206 + ... + 113563.

It is an arithmetic number, because the mean of its divisors is an integer number (10204650).

Almost surely, 2^40591651 is an apocalyptic number.

40591651 is a deficient number, since it is larger than the sum of its proper divisors (226949).

40591651 is a wasteful number, since it uses less digits than its factorization.

40591651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226948.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 40591651 is about 6371.1577440839. The cubic root of 40591651 is about 343.6731250241.

The spelling of 40591651 in words is "forty million, five hundred ninety-one thousand, six hundred fifty-one".