40555651 has 2 divisors, whose sum is σ = 40555652. Its totient is φ = 40555650.

The previous prime is 40555643. The next prime is 40555673. The reversal of 40555651 is 15655504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40555651 - 2³ = 40555643 is a prime.

It is not a weakly prime, because it can be changed into another prime (40552651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20277825 + 20277826.

It is an arithmetic number, because the mean of its divisors is an integer number (20277826).

Almost surely, 2^40555651 is an apocalyptic number.

40555651 is a deficient number, since it is larger than the sum of its proper divisors (1).

40555651 is an equidigital number, since it uses as much as digits as its factorization.

40555651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 40555651 is about 6368.3318851957. The cubic root of 40555651 is about 343.5714958174.

The spelling of 40555651 in words is "forty million, five hundred fifty-five thousand, six hundred fifty-one".