139501 has 2 divisors, whose sum is σ = 139502. Its totient is φ = 139500.

The previous prime is 139493. The next prime is 139511. The reversal of 139501 is 105931.

139501 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 2601 = 370^2 + 51^2 .

It is a cyclic number.

It is not a de Polignac number, because 139501 - 2³ = 139493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69750 + 69751.

It is an arithmetic number, because the mean of its divisors is an integer number (69751).

2¹³⁹⁵⁰¹ is an apocalyptic number.

It is an amenable number.

139501 is a deficient number, since it is larger than the sum of its proper divisors (1).

139501 is an equidigital number, since it uses as much as digits as its factorization.

139501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 139501 is about 373.4983266361. The cubic root of 139501 is about 51.8631758022.

The spelling of 139501 in words is "one hundred thirty-nine thousand, five hundred one".