2137948661 has 2 divisors, whose sum is σ = 2137948662. Its totient is φ = 2137948660.

The previous prime is 2137948633. The next prime is 2137948669. The reversal of 2137948661 is 1668497312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2006502436 + 131446225 = 44794^2 + 11465^2 .

It is a cyclic number.

It is not a de Polignac number, because 2137948661 - 2⁶ = 2137948597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2137948669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1068974330 + 1068974331.

It is an arithmetic number, because the mean of its divisors is an integer number (1068974331).

Almost surely, 2^2137948661 is an apocalyptic number.

It is an amenable number.

2137948661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2137948661 is an equidigital number, since it uses as much as digits as its factorization.

2137948661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 2137948661 is about 46237.9569293454. The cubic root of 2137948661 is about 1288.2468545299.

The spelling of 2137948661 in words is "two billion, one hundred thirty-seven million, nine hundred forty-eight thousand, six hundred sixty-one".