139681799 has 2 divisors, whose sum is σ = 139681800. Its totient is φ = 139681798.

The previous prime is 139681781. The next prime is 139681807. The reversal of 139681799 is 997186931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139681799 - 2⁸ = 139681543 is a prime.

It is a super-2 number, since 2×139681799² = 39022009943752802, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139681799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139681739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69840899 + 69840900.

It is an arithmetic number, because the mean of its divisors is an integer number (69840900).

Almost surely, 2^139681799 is an apocalyptic number.

139681799 is a deficient number, since it is larger than the sum of its proper divisors (1).

139681799 is an equidigital number, since it uses as much as digits as its factorization.

139681799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 53.

The square root of 139681799 is about 11818.7054705666. The cubic root of 139681799 is about 518.8557172842.

The spelling of 139681799 in words is "one hundred thirty-nine million, six hundred eighty-one thousand, seven hundred ninety-nine".