140211661 has 2 divisors, whose sum is σ = 140211662. Its totient is φ = 140211660.

The previous prime is 140211647. The next prime is 140211689. The reversal of 140211661 is 166112041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87067561 + 53144100 = 9331^2 + 7290^2 .

It is a cyclic number.

It is not a de Polignac number, because 140211661 - 2¹⁵ = 140178893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140211601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70105830 + 70105831.

It is an arithmetic number, because the mean of its divisors is an integer number (70105831).

Almost surely, 2^140211661 is an apocalyptic number.

It is an amenable number.

140211661 is a deficient number, since it is larger than the sum of its proper divisors (1).

140211661 is an equidigital number, since it uses as much as digits as its factorization.

140211661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 140211661 is about 11841.1004978423. The cubic root of 140211661 is about 519.5109566347.

The spelling of 140211661 in words is "one hundred forty million, two hundred eleven thousand, six hundred sixty-one".