139521743 has 2 divisors, whose sum is σ = 139521744. Its totient is φ = 139521742.

The previous prime is 139521677. The next prime is 139521787. The reversal of 139521743 is 347125931.

It is a strong prime.

It is an emirp because it is prime and its reverse (347125931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139521743 - 2²⁴ = 122744527 is a prime.

It is a super-3 number, since 3×139521743³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139521143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69760871 + 69760872.

It is an arithmetic number, because the mean of its divisors is an integer number (69760872).

Almost surely, 2^139521743 is an apocalyptic number.

139521743 is a deficient number, since it is larger than the sum of its proper divisors (1).

139521743 is an equidigital number, since it uses as much as digits as its factorization.

139521743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 35.

The square root of 139521743 is about 11811.9322297412. The cubic root of 139521743 is about 518.6574626053.

The spelling of 139521743 in words is "one hundred thirty-nine million, five hundred twenty-one thousand, seven hundred forty-three".