40091051 has 32 divisors (see below), whose sum is σ = 54437376. Its totient is φ = 28749600.

The previous prime is 40091027. The next prime is 40091059. The reversal of 40091051 is 15019004.

It is not a de Polignac number, because 40091051 - 2⁶ = 40090987 is a prime.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (40091059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120956 + ... + 121286.

It is an arithmetic number, because the mean of its divisors is an integer number (1701168).

Almost surely, 2^40091051 is an apocalyptic number.

40091051 is a deficient number, since it is larger than the sum of its proper divisors (14346325).

40091051 is a wasteful number, since it uses less digits than its factorization.

40091051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 40091051 is about 6331.7494422948. The cubic root of 40091051 is about 342.2544843923.

The spelling of 40091051 in words is "forty million, ninety-one thousand, fifty-one".