139745131 has 2 divisors, whose sum is σ = 139745132. Its totient is φ = 139745130.

The previous prime is 139745129. The next prime is 139745143. The reversal of 139745131 is 131547931.

It is a happy number.

139745131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139745131 - 2¹ = 139745129 is a prime.

It is a super-2 number, since 2×139745131² = 39057403276414322, which contains 22 as substring.

Together with 139745129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (139745161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69872565 + 69872566.

It is an arithmetic number, because the mean of its divisors is an integer number (69872566).

Almost surely, 2^139745131 is an apocalyptic number.

139745131 is the 7477-th centered pentagonal number.

139745131 is a deficient number, since it is larger than the sum of its proper divisors (1).

139745131 is an equidigital number, since it uses as much as digits as its factorization.

139745131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 34.

The square root of 139745131 is about 11821.3844789855. The cubic root of 139745131 is about 518.9341221670.

It can be divided in two parts, 139745 and 131, that added together give a square (139876 = 374²).

The spelling of 139745131 in words is "one hundred thirty-nine million, seven hundred forty-five thousand, one hundred thirty-one".