138981501 has 10 divisors (see below), whose sum is σ = 207614462. Its totient is φ = 92654280.

The previous prime is 138981499. The next prime is 138981527. The reversal of 138981501 is 105189831.

It can be written as a sum of positive squares in only one way, i.e., 110880900 + 28100601 = 10530^2 + 5301^2 .

It is not a de Polignac number, because 138981501 - 2¹ = 138981499 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138981541) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 857830 + ... + 857991.

Almost surely, 2^138981501 is an apocalyptic number.

It is an amenable number.

138981501 is a deficient number, since it is larger than the sum of its proper divisors (68632961).

138981501 is an equidigital number, since it uses as much as digits as its factorization.

138981501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715833 (or 1715824 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 36.

The square root of 138981501 is about 11789.0415640967. The cubic root of 138981501 is about 517.9871656952.

The spelling of 138981501 in words is "one hundred thirty-eight million, nine hundred eighty-one thousand, five hundred one".