140991911 has 2 divisors, whose sum is σ = 140991912. Its totient is φ = 140991910.

The previous prime is 140991901. The next prime is 140991943. The reversal of 140991911 is 119199041.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 140991911 - 2¹⁸ = 140729767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140991901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70495955 + 70495956.

It is an arithmetic number, because the mean of its divisors is an integer number (70495956).

Almost surely, 2^140991911 is an apocalyptic number.

140991911 is a deficient number, since it is larger than the sum of its proper divisors (1).

140991911 is an equidigital number, since it uses as much as digits as its factorization.

140991911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 35.

The square root of 140991911 is about 11874.0014738082. The cubic root of 140991911 is about 520.4728329924.

Subtracting from 140991911 its sum of digits (35), we obtain a square (140991876 = 11874²).

The spelling of 140991911 in words is "one hundred forty million, nine hundred ninety-one thousand, nine hundred eleven".