139801 has 2 divisors, whose sum is σ = 139802. Its totient is φ = 139800.

The previous prime is 139787. The next prime is 139813. The reversal of 139801 is 108931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129600 + 10201 = 360^2 + 101^2 .

It is a cyclic number.

It is not a de Polignac number, because 139801 - 2¹⁵ = 107033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69900 + 69901.

It is an arithmetic number, because the mean of its divisors is an integer number (69901).

2¹³⁹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

139801 is a deficient number, since it is larger than the sum of its proper divisors (1).

139801 is an equidigital number, since it uses as much as digits as its factorization.

139801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 139801 is about 373.8997191761. The cubic root of 139801 is about 51.9003268208.

The spelling of 139801 in words is "one hundred thirty-nine thousand, eight hundred one".