139891811 has 2 divisors, whose sum is σ = 139891812. Its totient is φ = 139891810.

The previous prime is 139891781. The next prime is 139891837. The reversal of 139891811 is 118198931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139891811 - 2¹⁸ = 139629667 is a prime.

It is not a weakly prime, because it can be changed into another prime (139891841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69945905 + 69945906.

It is an arithmetic number, because the mean of its divisors is an integer number (69945906).

Almost surely, 2^139891811 is an apocalyptic number.

139891811 is a deficient number, since it is larger than the sum of its proper divisors (1).

139891811 is an equidigital number, since it uses as much as digits as its factorization.

139891811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 41.

The square root of 139891811 is about 11827.5868629235. The cubic root of 139891811 is about 519.1156207769.

The spelling of 139891811 in words is "one hundred thirty-nine million, eight hundred ninety-one thousand, eight hundred eleven".