2199561857 has 2 divisors, whose sum is σ = 2199561858. Its totient is φ = 2199561856.

The previous prime is 2199561823. The next prime is 2199561863. The reversal of 2199561857 is 7581659912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2156580721 + 42981136 = 46439^2 + 6556^2 .

It is a cyclic number.

It is not a de Polignac number, because 2199561857 - 2¹⁴ = 2199545473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2199561799 and 2199561808.

It is not a weakly prime, because it can be changed into another prime (2159561857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1099780928 + 1099780929.

It is an arithmetic number, because the mean of its divisors is an integer number (1099780929).

Almost surely, 2^2199561857 is an apocalyptic number.

It is an amenable number.

2199561857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2199561857 is an equidigital number, since it uses as much as digits as its factorization.

2199561857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 53.

The square root of 2199561857 is about 46899.4867455924. The cubic root of 2199561857 is about 1300.5051009617.

The spelling of 2199561857 in words is "two billion, one hundred ninety-nine million, five hundred sixty-one thousand, eight hundred fifty-seven".