40403551 has 2 divisors, whose sum is σ = 40403552. Its totient is φ = 40403550.

The previous prime is 40403527. The next prime is 40403563. The reversal of 40403551 is 15530404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40403551 - 2⁹ = 40403039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40403581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20201775 + 20201776.

It is an arithmetic number, because the mean of its divisors is an integer number (20201776).

Almost surely, 2^40403551 is an apocalyptic number.

40403551 is a deficient number, since it is larger than the sum of its proper divisors (1).

40403551 is an equidigital number, since it uses as much as digits as its factorization.

40403551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 40403551 is about 6356.3787646741. The cubic root of 40403551 is about 343.1414473267.

Adding to 40403551 its reverse (15530404), we get a palindrome (55933955).

The spelling of 40403551 in words is "forty million, four hundred three thousand, five hundred fifty-one".