51019947 has 24 divisors (see below), whose sum is σ = 80790528. Its totient is φ = 30769200.

The previous prime is 51019933. The next prime is 51019951. The reversal of 51019947 is 74991015.

It is not a de Polignac number, because 51019947 - 2⁴ = 51019931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51019987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20922 + ... + 23232.

It is an arithmetic number, because the mean of its divisors is an integer number (3366272).

Almost surely, 2^51019947 is an apocalyptic number.

51019947 is a deficient number, since it is larger than the sum of its proper divisors (29770581).

51019947 is a wasteful number, since it uses less digits than its factorization.

51019947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551 (or 2548 counting only the distinct ones).

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

The square root of 51019947 is about 7142.8248613556. The cubic root of 51019947 is about 370.8913183690.

The spelling of 51019947 in words is "fifty-one million, nineteen thousand, nine hundred forty-seven".