251374729 has 2 divisors, whose sum is σ = 251374730. Its totient is φ = 251374728.

The previous prime is 251374723. The next prime is 251374757. The reversal of 251374729 is 927473152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239630400 + 11744329 = 15480^2 + 3427^2 .

It is a cyclic number.

It is not a de Polignac number, because 251374729 - 2¹⁹ = 250850441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251374691 and 251374700.

It is not a weakly prime, because it can be changed into another prime (251374723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125687364 + 125687365.

It is an arithmetic number, because the mean of its divisors is an integer number (125687365).

Almost surely, 2^251374729 is an apocalyptic number.

It is an amenable number.

251374729 is a deficient number, since it is larger than the sum of its proper divisors (1).

251374729 is an equidigital number, since it uses as much as digits as its factorization.

251374729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 40.

The square root of 251374729 is about 15854.8014494033. The cubic root of 251374729 is about 631.1131148603.

The spelling of 251374729 in words is "two hundred fifty-one million, three hundred seventy-four thousand, seven hundred twenty-nine".