252478691 has 2 divisors, whose sum is σ = 252478692. Its totient is φ = 252478690.

The previous prime is 252478673. The next prime is 252478703. The reversal of 252478691 is 196874252.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 252478691 - 2¹⁴ = 252462307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (252478091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126239345 + 126239346.

It is an arithmetic number, because the mean of its divisors is an integer number (126239346).

Almost surely, 2^252478691 is an apocalyptic number.

252478691 is a deficient number, since it is larger than the sum of its proper divisors (1).

252478691 is an equidigital number, since it uses as much as digits as its factorization.

252478691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 252478691 is about 15889.5780623653. The cubic root of 252478691 is about 632.0356518303.

The spelling of 252478691 in words is "two hundred fifty-two million, four hundred seventy-eight thousand, six hundred ninety-one".