140251961 has 2 divisors, whose sum is σ = 140251962. Its totient is φ = 140251960.

The previous prime is 140251949. The next prime is 140252039. The reversal of 140251961 is 169152041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124099600 + 16152361 = 11140^2 + 4019^2 .

It is a cyclic number.

It is not a de Polignac number, because 140251961 - 2⁶ = 140251897 is a prime.

It is a super-2 number, since 2×140251961² = 39341225128691042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140251361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70125980 + 70125981.

It is an arithmetic number, because the mean of its divisors is an integer number (70125981).

Almost surely, 2^140251961 is an apocalyptic number.

It is an amenable number.

140251961 is a deficient number, since it is larger than the sum of its proper divisors (1).

140251961 is an equidigital number, since it uses as much as digits as its factorization.

140251961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 140251961 is about 11842.8020755225. The cubic root of 140251961 is about 519.5607249299.

The spelling of 140251961 in words is "one hundred forty million, two hundred fifty-one thousand, nine hundred sixty-one".