139504381 has 2 divisors, whose sum is σ = 139504382. Its totient is φ = 139504380.

The previous prime is 139504307. The next prime is 139504399. The reversal of 139504381 is 183405931.

139504381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135932281 + 3572100 = 11659^2 + 1890^2 .

It is a cyclic number.

It is not a de Polignac number, because 139504381 - 2⁹ = 139503869 is a prime.

It is a super-2 number, since 2×139504381² = 38922944636386322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139504301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69752190 + 69752191.

It is an arithmetic number, because the mean of its divisors is an integer number (69752191).

Almost surely, 2^139504381 is an apocalyptic number.

It is an amenable number.

139504381 is a deficient number, since it is larger than the sum of its proper divisors (1).

139504381 is an equidigital number, since it uses as much as digits as its factorization.

139504381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 139504381 is about 11811.1972720804. The cubic root of 139504381 is about 518.6359479075.

The spelling of 139504381 in words is "one hundred thirty-nine million, five hundred four thousand, three hundred eighty-one".