139515983381 has 4 divisors (see below), whose sum is σ = 139517028000. Its totient is φ = 139514938764.

The previous prime is 139515983377. The next prime is 139515983389. The reversal of 139515983381 is 183389515931.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 183389515931 = 257 ⋅713577883.

It is a cyclic number.

It is not a de Polignac number, because 139515983381 - 2² = 139515983377 is a prime.

It is a super-2 number, since 2×139515983381² (a number of 23 digits) 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 (139515983389) 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, 286481 + ... + 600918.

It is an arithmetic number, because the mean of its divisors is an integer number (34879257000).

Almost surely, 2^139515983381 is an apocalyptic number.

It is an amenable number.

139515983381 is a deficient number, since it is larger than the sum of its proper divisors (1044619).

139515983381 is an equidigital number, since it uses as much as digits as its factorization.

139515983381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044618.

The product of its digits is 3499200, while the sum is 56.

The spelling of 139515983381 in words is "one hundred thirty-nine billion, five hundred fifteen million, nine hundred eighty-three thousand, three hundred eighty-one".