51469729 has 2 divisors, whose sum is σ = 51469730. Its totient is φ = 51469728.

The previous prime is 51469723. The next prime is 51469739. The reversal of 51469729 is 92796415.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44957025 + 6512704 = 6705^2 + 2552^2 .

It is a cyclic number.

It is not a de Polignac number, because 51469729 - 2³ = 51469721 is a prime.

It is not a weakly prime, because it can be changed into another prime (51469721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25734864 + 25734865.

It is an arithmetic number, because the mean of its divisors is an integer number (25734865).

Almost surely, 2^51469729 is an apocalyptic number.

It is an amenable number.

51469729 is a deficient number, since it is larger than the sum of its proper divisors (1).

51469729 is an equidigital number, since it uses as much as digits as its factorization.

51469729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 51469729 is about 7174.2406566828. The cubic root of 51469729 is about 371.9780332541.

The spelling of 51469729 in words is "fifty-one million, four hundred sixty-nine thousand, seven hundred twenty-nine".