58891981 has 2 divisors, whose sum is σ = 58891982. Its totient is φ = 58891980.

The previous prime is 58891979. The next prime is 58891991. The reversal of 58891981 is 18919885.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49070025 + 9821956 = 7005^2 + 3134^2 .

It is a cyclic number.

It is not a de Polignac number, because 58891981 - 2¹ = 58891979 is a prime.

It is a super-2 number, since 2×58891981² = 6936530852208722, which contains 22 as substring.

Together with 58891979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (58891951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29445990 + 29445991.

It is an arithmetic number, because the mean of its divisors is an integer number (29445991).

Almost surely, 2^58891981 is an apocalyptic number.

It is an amenable number.

58891981 is a deficient number, since it is larger than the sum of its proper divisors (1).

58891981 is an equidigital number, since it uses as much as digits as its factorization.

58891981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 49.

The square root of 58891981 is about 7674.1110885887. Note that the first 3 decimals coincide. The cubic root of 58891981 is about 389.0619158962.

The spelling of 58891981 in words is "fifty-eight million, eight hundred ninety-one thousand, nine hundred eighty-one".