51120847 has 4 divisors (see below), whose sum is σ = 51627096. Its totient is φ = 50614600.

The previous prime is 51120841. The next prime is 51120863. The reversal of 51120847 is 74802115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51120847 is a prime.

It is a super-2 number, since 2×51120847² = 5226681995994818, 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 (51120841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252973 + ... + 253174.

It is an arithmetic number, because the mean of its divisors is an integer number (12906774).

Almost surely, 2^51120847 is an apocalyptic number.

51120847 is a deficient number, since it is larger than the sum of its proper divisors (506249).

51120847 is a wasteful number, since it uses less digits than its factorization.

51120847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506248.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 51120847 is about 7149.8844046600. The cubic root of 51120847 is about 371.1356560798.

The spelling of 51120847 in words is "fifty-one million, one hundred twenty thousand, eight hundred forty-seven".