139213751 has 2 divisors, whose sum is σ = 139213752. Its totient is φ = 139213750.

The previous prime is 139213729. The next prime is 139213813. The reversal of 139213751 is 157312931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139213751 - 2²⁶ = 72104887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139216751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69606875 + 69606876.

It is an arithmetic number, because the mean of its divisors is an integer number (69606876).

Almost surely, 2^139213751 is an apocalyptic number.

139213751 is a deficient number, since it is larger than the sum of its proper divisors (1).

139213751 is an equidigital number, since it uses as much as digits as its factorization.

139213751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 32.

The square root of 139213751 is about 11798.8877018133. The cubic root of 139213751 is about 518.2755387726.

The spelling of 139213751 in words is "one hundred thirty-nine million, two hundred thirteen thousand, seven hundred fifty-one".