258243731 has 2 divisors, whose sum is σ = 258243732. Its totient is φ = 258243730.

The previous prime is 258243703. The next prime is 258243743. The reversal of 258243731 is 137342852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 258243731 - 2¹⁸ = 257981587 is a prime.

It is a super-2 number, since 2×258243731² = 133379649201600722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 258243691 and 258243700.

It is not a weakly prime, because it can be changed into another prime (258243031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129121865 + 129121866.

It is an arithmetic number, because the mean of its divisors is an integer number (129121866).

Almost surely, 2^258243731 is an apocalyptic number.

258243731 is a deficient number, since it is larger than the sum of its proper divisors (1).

258243731 is an equidigital number, since it uses as much as digits as its factorization.

258243731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 35.

The square root of 258243731 is about 16069.9636278369. The cubic root of 258243731 is about 636.8100800191.

The spelling of 258243731 in words is "two hundred fifty-eight million, two hundred forty-three thousand, seven hundred thirty-one".