40109831 has 2 divisors, whose sum is σ = 40109832. Its totient is φ = 40109830.

The previous prime is 40109803. The next prime is 40109837. The reversal of 40109831 is 13890104.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40109831 is a prime.

It is a super-2 number, since 2×40109831² = 3217597085697122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40109831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40109837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20054915 + 20054916.

It is an arithmetic number, because the mean of its divisors is an integer number (20054916).

Almost surely, 2^40109831 is an apocalyptic number.

40109831 is a deficient number, since it is larger than the sum of its proper divisors (1).

40109831 is an equidigital number, since it uses as much as digits as its factorization.

40109831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 40109831 is about 6333.2322711235. The cubic root of 40109831 is about 342.3079172299.

Adding to 40109831 its reverse (13890104), we get a palindrome (53999935).

The spelling of 40109831 in words is "forty million, one hundred nine thousand, eight hundred thirty-one".