458861981 has 2 divisors, whose sum is σ = 458861982. Its totient is φ = 458861980.

The previous prime is 458861933. The next prime is 458861993. The reversal of 458861981 is 189168854.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451945081 + 6916900 = 21259^2 + 2630^2 .

It is a cyclic number.

It is not a de Polignac number, because 458861981 - 2⁶ = 458861917 is a prime.

It is a super-2 number, since 2×458861981² = 421108635214488722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (458866981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 229430990 + 229430991.

It is an arithmetic number, because the mean of its divisors is an integer number (229430991).

Almost surely, 2^458861981 is an apocalyptic number.

It is an amenable number.

458861981 is a deficient number, since it is larger than the sum of its proper divisors (1).

458861981 is an equidigital number, since it uses as much as digits as its factorization.

458861981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 552960, while the sum is 50.

The square root of 458861981 is about 21421.0639558356. The cubic root of 458861981 is about 771.3071522976.

The spelling of 458861981 in words is "four hundred fifty-eight million, eight hundred sixty-one thousand, nine hundred eighty-one".