139873451 has 2 divisors, whose sum is σ = 139873452. Its totient is φ = 139873450.

The previous prime is 139873439. The next prime is 139873471. The reversal of 139873451 is 154378931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139873451 - 2¹⁰ = 139872427 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 139873399 and 139873408.

It is not a weakly prime, because it can be changed into another prime (139873411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69936725 + 69936726.

It is an arithmetic number, because the mean of its divisors is an integer number (69936726).

Almost surely, 2^139873451 is an apocalyptic number.

139873451 is a deficient number, since it is larger than the sum of its proper divisors (1).

139873451 is an equidigital number, since it uses as much as digits as its factorization.

139873451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 139873451 is about 11826.8106858950. The cubic root of 139873451 is about 519.0929094646.

The spelling of 139873451 in words is "one hundred thirty-nine million, eight hundred seventy-three thousand, four hundred fifty-one".