140390999681 has 2 divisors, whose sum is σ = 140390999682. Its totient is φ = 140390999680.

The previous prime is 140390999657. The next prime is 140390999699. The reversal of 140390999681 is 186999093041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135123143281 + 5267856400 = 367591^2 + 72580^2 .

It is a cyclic number.

It is not a de Polignac number, because 140390999681 - 2¹⁸ = 140390737537 is a prime.

It is a super-2 number, since 2×140390999681² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 140390999681.

It is not a weakly prime, because it can be changed into another prime (140390939681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70195499840 + 70195499841.

It is an arithmetic number, because the mean of its divisors is an integer number (70195499841).

Almost surely, 2^140390999681 is an apocalyptic number.

It is an amenable number.

140390999681 is a deficient number, since it is larger than the sum of its proper divisors (1).

140390999681 is an equidigital number, since it uses as much as digits as its factorization.

140390999681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 59.

The spelling of 140390999681 in words is "one hundred forty billion, three hundred ninety million, nine hundred ninety-nine thousand, six hundred eighty-one".