40651901 has 4 divisors (see below), whose sum is σ = 41418972. Its totient is φ = 39884832.

The previous prime is 40651889. The next prime is 40651921. The reversal of 40651901 is 10915604.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28408900 + 12243001 = 5330^2 + 3499^2 .

It is not a de Polignac number, because 40651901 - 2⁶ = 40651837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40651921) 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, 383456 + ... + 383561.

It is an arithmetic number, because the mean of its divisors is an integer number (10354743).

Almost surely, 2^40651901 is an apocalyptic number.

It is an amenable number.

40651901 is a deficient number, since it is larger than the sum of its proper divisors (767071).

40651901 is an equidigital number, since it uses as much as digits as its factorization.

40651901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767070.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 40651901 is about 6375.8843308203. The cubic root of 40651901 is about 343.8430784419.

The spelling of 40651901 in words is "forty million, six hundred fifty-one thousand, nine hundred one".