51442739 has 2 divisors, whose sum is σ = 51442740. Its totient is φ = 51442738.

The previous prime is 51442717. The next prime is 51442759. The reversal of 51442739 is 93724415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51442739 - 2¹⁶ = 51377203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51442699 and 51442708.

It is not a weakly prime, because it can be changed into another prime (51442759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25721369 + 25721370.

It is an arithmetic number, because the mean of its divisors is an integer number (25721370).

Almost surely, 2^51442739 is an apocalyptic number.

51442739 is a deficient number, since it is larger than the sum of its proper divisors (1).

51442739 is an equidigital number, since it uses as much as digits as its factorization.

51442739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 51442739 is about 7172.3593747107. The cubic root of 51442739 is about 371.9130018741.

The spelling of 51442739 in words is "fifty-one million, four hundred forty-two thousand, seven hundred thirty-nine".