140091691 has 2 divisors, whose sum is σ = 140091692. Its totient is φ = 140091690.

The previous prime is 140091661. The next prime is 140091709. The reversal of 140091691 is 196190041.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 140091691 - 2⁹ = 140091179 is a prime.

It is not a weakly prime, because it can be changed into another prime (140091661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70045845 + 70045846.

It is an arithmetic number, because the mean of its divisors is an integer number (70045846).

Almost surely, 2^140091691 is an apocalyptic number.

140091691 is a deficient number, since it is larger than the sum of its proper divisors (1).

140091691 is an equidigital number, since it uses as much as digits as its factorization.

140091691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 140091691 is about 11836.0335839334. The cubic root of 140091691 is about 519.3627437744.

The spelling of 140091691 in words is "one hundred forty million, ninety-one thousand, six hundred ninety-one".