140197961 has 2 divisors, whose sum is σ = 140197962. Its totient is φ = 140197960.

The previous prime is 140197957. The next prime is 140198053. The reversal of 140197961 is 169791041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121440400 + 18757561 = 11020^2 + 4331^2 .

It is a cyclic number.

It is not a de Polignac number, because 140197961 - 2² = 140197957 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (140197661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70098980 + 70098981.

It is an arithmetic number, because the mean of its divisors is an integer number (70098981).

Almost surely, 2^140197961 is an apocalyptic number.

It is an amenable number.

140197961 is a deficient number, since it is larger than the sum of its proper divisors (1).

140197961 is an equidigital number, since it uses as much as digits as its factorization.

140197961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 140197961 is about 11840.5219901827. The cubic root of 140197961 is about 519.4940357122.

The spelling of 140197961 in words is "one hundred forty million, one hundred ninety-seven thousand, nine hundred sixty-one".