36405431 has 2 divisors, whose sum is σ = 36405432. Its totient is φ = 36405430.

The previous prime is 36405427. The next prime is 36405433. The reversal of 36405431 is 13450463.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 36405431 - 2² = 36405427 is a prime.

It is a super-2 number, since 2×36405431² = 2650710812591522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 36405433, it forms a pair of twin primes.

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 36405431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36405433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18202715 + 18202716.

It is an arithmetic number, because the mean of its divisors is an integer number (18202716).

Almost surely, 2^36405431 is an apocalyptic number.

36405431 is a deficient number, since it is larger than the sum of its proper divisors (1).

36405431 is an equidigital number, since it uses as much as digits as its factorization.

36405431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 36405431 is about 6033.6913245541. The cubic root of 36405431 is about 331.4276409949.

Adding to 36405431 its reverse (13450463), we get a palindrome (49855894).

The spelling of 36405431 in words is "thirty-six million, four hundred five thousand, four hundred thirty-one".