40642051 has 2 divisors, whose sum is σ = 40642052. Its totient is φ = 40642050.

The previous prime is 40642039. The next prime is 40642061. The reversal of 40642051 is 15024604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40642051 - 2⁹ = 40641539 is a prime.

It is not a weakly prime, because it can be changed into another prime (40642001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20321025 + 20321026.

It is an arithmetic number, because the mean of its divisors is an integer number (20321026).

Almost surely, 2^40642051 is an apocalyptic number.

40642051 is a deficient number, since it is larger than the sum of its proper divisors (1).

40642051 is an equidigital number, since it uses as much as digits as its factorization.

40642051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 40642051 is about 6375.1118421562. Note that the first 3 decimals coincide. The cubic root of 40642051 is about 343.8153050142.

Adding to 40642051 its reverse (15024604), we get a palindrome (55666655).

The spelling of 40642051 in words is "forty million, six hundred forty-two thousand, fifty-one".