58138781 has 4 divisors (see below), whose sum is σ = 59006592. Its totient is φ = 57270972.

The previous prime is 58138763. The next prime is 58138789. The reversal of 58138781 is 18783185.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18783185 = 5 ⋅3756637.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-58138781 is a prime.

It is a super-2 number, since 2×58138781² = 6760235712331922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (58138789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433805 + ... + 433938.

It is an arithmetic number, because the mean of its divisors is an integer number (14751648).

Almost surely, 2^58138781 is an apocalyptic number.

It is an amenable number.

58138781 is a deficient number, since it is larger than the sum of its proper divisors (867811).

58138781 is an equidigital number, since it uses as much as digits as its factorization.

58138781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867810.

The product of its digits is 53760, while the sum is 41.

The square root of 58138781 is about 7624.8790810084. The cubic root of 58138781 is about 387.3961561490.

The spelling of 58138781 in words is "fifty-eight million, one hundred thirty-eight thousand, seven hundred eighty-one".