140642791 has 2 divisors, whose sum is σ = 140642792. Its totient is φ = 140642790.

The previous prime is 140642783. The next prime is 140642839. The reversal of 140642791 is 197246041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 140642791 - 2³ = 140642783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140642701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70321395 + 70321396.

It is an arithmetic number, because the mean of its divisors is an integer number (70321396).

Almost surely, 2^140642791 is an apocalyptic number.

140642791 is a deficient number, since it is larger than the sum of its proper divisors (1).

140642791 is an equidigital number, since it uses as much as digits as its factorization.

140642791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 140642791 is about 11859.2913363320. The cubic root of 140642791 is about 520.0428847768.

The spelling of 140642791 in words is "one hundred forty million, six hundred forty-two thousand, seven hundred ninety-one".