2390043691961 has 2 divisors, whose sum is σ = 2390043691962. Its totient is φ = 2390043691960.

The previous prime is 2390043691951. The next prime is 2390043692011. The reversal of 2390043691961 is 1691963400932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2369964801961 + 20078890000 = 1539469^2 + 141700^2 .

It is a cyclic number.

It is not a de Polignac number, because 2390043691961 - 2⁶ = 2390043691897 is a prime.

It is not a weakly prime, because it can be changed into another prime (2390043691951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1195021845980 + 1195021845981.

It is an arithmetic number, because the mean of its divisors is an integer number (1195021845981).

Almost surely, 2^{2390043691961} is an apocalyptic number.

It is an amenable number.

2390043691961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2390043691961 is an equidigital number, since it uses as much as digits as its factorization.

2390043691961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 53.

The spelling of 2390043691961 in words is "two trillion, three hundred ninety billion, forty-three million, six hundred ninety-one thousand, nine hundred sixty-one".