140197661 has 2 divisors, whose sum is σ = 140197662. Its totient is φ = 140197660.

The previous prime is 140197649. The next prime is 140197679. The reversal of 140197661 is 166791041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101384761 + 38812900 = 10069^2 + 6230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140197661 is a prime.

It is a Chen prime.

It is equal to p_7922735 and since 140197661 and 7922735 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140197601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70098830 + 70098831.

It is an arithmetic number, because the mean of its divisors is an integer number (70098831).

Almost surely, 2^140197661 is an apocalyptic number.

It is an amenable number.

140197661 is a deficient number, since it is larger than the sum of its proper divisors (1).

140197661 is an equidigital number, since it uses as much as digits as its factorization.

140197661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 140197661 is about 11840.5093218155. The cubic root of 140197661 is about 519.4936651687.

The spelling of 140197661 in words is "one hundred forty million, one hundred ninety-seven thousand, six hundred sixty-one".