138702131 has 2 divisors, whose sum is σ = 138702132. Its totient is φ = 138702130.

The previous prime is 138702119. The next prime is 138702197. The reversal of 138702131 is 131207831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138702131 - 2¹⁰ = 138701107 is a prime.

It is a super-2 number, since 2×138702131² = 38476562287882322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138702131.

It is not a weakly prime, because it can be changed into another prime (138704131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69351065 + 69351066.

It is an arithmetic number, because the mean of its divisors is an integer number (69351066).

Almost surely, 2^138702131 is an apocalyptic number.

138702131 is a deficient number, since it is larger than the sum of its proper divisors (1).

138702131 is an equidigital number, since it uses as much as digits as its factorization.

138702131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 138702131 is about 11777.1868882174. The cubic root of 138702131 is about 517.6398601340.

Adding to 138702131 its reverse (131207831), we get a palindrome (269909962).

The spelling of 138702131 in words is "one hundred thirty-eight million, seven hundred two thousand, one hundred thirty-one".