258724981 has 2 divisors, whose sum is σ = 258724982. Its totient is φ = 258724980.

The previous prime is 258724951. The next prime is 258724987. The reversal of 258724981 is 189427852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223024356 + 35700625 = 14934^2 + 5975^2 .

It is a cyclic number.

It is not a de Polignac number, because 258724981 - 2¹³ = 258716789 is a prime.

It is a super-2 number, since 2×258724981² = 133877231586900722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258724987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129362490 + 129362491.

It is an arithmetic number, because the mean of its divisors is an integer number (129362491).

Almost surely, 2^258724981 is an apocalyptic number.

It is an amenable number.

258724981 is a deficient number, since it is larger than the sum of its proper divisors (1).

258724981 is an equidigital number, since it uses as much as digits as its factorization.

258724981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 258724981 is about 16084.9302454192. The cubic root of 258724981 is about 637.2054102702.

The spelling of 258724981 in words is "two hundred fifty-eight million, seven hundred twenty-four thousand, nine hundred eighty-one".