2539393681 has 16 divisors (see below), whose sum is σ = 2983875840. Its totient is φ = 2136168720.

The previous prime is 2539393673. The next prime is 2539393693. The reversal of 2539393681 is 1863939352.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2539393681 - 2³ = 2539393673 is a prime.

It is a super-2 number, since 2×2539393681² = 12897040534205459522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2539393481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132295 + ... + 150268.

It is an arithmetic number, because the mean of its divisors is an integer number (186492240).

Almost surely, 2^2539393681 is an apocalyptic number.

It is an amenable number.

2539393681 is a deficient number, since it is larger than the sum of its proper divisors (444482159).

2539393681 is a wasteful number, since it uses less digits than its factorization.

2539393681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282636.

The product of its digits is 1049760, while the sum is 49.

The square root of 2539393681 is about 50392.3970555083. The cubic root of 2539393681 is about 1364.3004158875.

The spelling of 2539393681 in words is "two billion, five hundred thirty-nine million, three hundred ninety-three thousand, six hundred eighty-one".