240691961 has 2 divisors, whose sum is σ = 240691962. Its totient is φ = 240691960.

The previous prime is 240691937. The next prime is 240691963. The reversal of 240691961 is 169196042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165765625 + 74926336 = 12875^2 + 8656^2 .

It is a cyclic number.

It is not a de Polignac number, because 240691961 - 2²⁶ = 173583097 is a prime.

Together with 240691963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (240691963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120345980 + 120345981.

It is an arithmetic number, because the mean of its divisors is an integer number (120345981).

Almost surely, 2^240691961 is an apocalyptic number.

It is an amenable number.

240691961 is a deficient number, since it is larger than the sum of its proper divisors (1).

240691961 is an equidigital number, since it uses as much as digits as its factorization.

240691961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 240691961 is about 15514.2502558132. The cubic root of 240691961 is about 622.0431735971.

The spelling of 240691961 in words is "two hundred forty million, six hundred ninety-one thousand, nine hundred sixty-one".