51409791 has 6 divisors (see below), whose sum is σ = 74258600. Its totient is φ = 34273188.

The previous prime is 51409783. The next prime is 51409829. The reversal of 51409791 is 19790415.

It is not a de Polignac number, because 51409791 - 2³ = 51409783 is a prime.

It is a super-2 number, since 2×51409791² = 5285933221327362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51409291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2856091 + ... + 2856108.

Almost surely, 2^51409791 is an apocalyptic number.

51409791 is a deficient number, since it is larger than the sum of its proper divisors (22848809).

51409791 is a wasteful number, since it uses less digits than its factorization.

51409791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5712205 (or 5712202 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 51409791 is about 7170.0621336220. The cubic root of 51409791 is about 371.8335840796.

The spelling of 51409791 in words is "fifty-one million, four hundred nine thousand, seven hundred ninety-one".