51304781 has 12 divisors (see below), whose sum is σ = 56871360. Its totient is φ = 45900360.

The previous prime is 51304763. The next prime is 51304831. The reversal of 51304781 is 18740315.

It is not a de Polignac number, because 51304781 - 2¹⁰ = 51303757 is a prime.

It is a super-2 number, since 2×51304781² = 5264361106915922, 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 (51304751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48860 + ... + 49898.

It is an arithmetic number, because the mean of its divisors is an integer number (4739280).

Almost surely, 2^51304781 is an apocalyptic number.

It is an amenable number.

51304781 is a deficient number, since it is larger than the sum of its proper divisors (5566579).

51304781 is a wasteful number, since it uses less digits than its factorization.

51304781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184 (or 1117 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 51304781 is about 7162.7355807680. The cubic root of 51304781 is about 371.5802415451.

The spelling of 51304781 in words is "fifty-one million, three hundred four thousand, seven hundred eighty-one".