5918086781 has 4 divisors (see below), whose sum is σ = 5925384864. Its totient is φ = 5910788700.

The previous prime is 5918086771. The next prime is 5918086793. The reversal of 5918086781 is 1876808195.

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: 1876808195 = 5 ⋅375361639.

It is a cyclic number.

It is not a de Polignac number, because 5918086781 - 2¹⁰ = 5918085757 is a prime.

It is a super-2 number, since 2×5918086781² = 70047502294893883922, 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 (5918086771) 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, 3647825 + ... + 3649446.

It is an arithmetic number, because the mean of its divisors is an integer number (1481346216).

Almost surely, 2^5918086781 is an apocalyptic number.

It is an amenable number.

5918086781 is a deficient number, since it is larger than the sum of its proper divisors (7298083).

5918086781 is an equidigital number, since it uses as much as digits as its factorization.

5918086781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7298082.

The product of its (nonzero) digits is 967680, while the sum is 53.

The square root of 5918086781 is about 76929.1023020547. The cubic root of 5918086781 is about 1808.8134405387.

The spelling of 5918086781 in words is "five billion, nine hundred eighteen million, eighty-six thousand, seven hundred eighty-one".