51742147 has 2 divisors, whose sum is σ = 51742148. Its totient is φ = 51742146.

The previous prime is 51742139. The next prime is 51742183. The reversal of 51742147 is 74124715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51742147 - 2³ = 51742139 is a prime.

It is not a weakly prime, because it can be changed into another prime (51752147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25871073 + 25871074.

It is an arithmetic number, because the mean of its divisors is an integer number (25871074).

Almost surely, 2^51742147 is an apocalyptic number.

51742147 is a deficient number, since it is larger than the sum of its proper divisors (1).

51742147 is an equidigital number, since it uses as much as digits as its factorization.

51742147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 31.

The square root of 51742147 is about 7193.2014430294. The cubic root of 51742147 is about 372.6331449024.

The spelling of 51742147 in words is "fifty-one million, seven hundred forty-two thousand, one hundred forty-seven".