139713281 has 8 divisors (see below), whose sum is σ = 146168064. Its totient is φ = 133403680.

The previous prime is 139713263. The next prime is 139713307. The reversal of 139713281 is 182317931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139713281 - 2²⁶ = 72604417 is a prime.

It is a super-2 number, since 2×139713281² = 39039601775569922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139713781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34325 + ... + 38178.

It is an arithmetic number, because the mean of its divisors is an integer number (18271008).

Almost surely, 2^139713281 is an apocalyptic number.

It is an amenable number.

139713281 is a deficient number, since it is larger than the sum of its proper divisors (6454783).

139713281 is an equidigital number, since it uses as much as digits as its factorization.

139713281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72591.

The product of its digits is 9072, while the sum is 35.

The square root of 139713281 is about 11820.0372672847. The cubic root of 139713281 is about 518.8946948956.

The spelling of 139713281 in words is "one hundred thirty-nine million, seven hundred thirteen thousand, two hundred eighty-one".