1199989961 has 2 divisors, whose sum is σ = 1199989962. Its totient is φ = 1199989960.

The previous prime is 1199989951. The next prime is 1199989969. The reversal of 1199989961 is 1699899911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 849139600 + 350850361 = 29140^2 + 18731^2 .

It is a cyclic number.

It is not a de Polignac number, because 1199989961 - 2²⁶ = 1132881097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1199989894 and 1199989903.

It is not a weakly prime, because it can be changed into another prime (1199989969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599994980 + 599994981.

It is an arithmetic number, because the mean of its divisors is an integer number (599994981).

Almost surely, 2^1199989961 is an apocalyptic number.

It is an amenable number.

1199989961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1199989961 is an equidigital number, since it uses as much as digits as its factorization.

1199989961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 62.

The square root of 1199989961 is about 34640.8712505907. The cubic root of 1199989961 is about 1062.6556058329.

The spelling of 1199989961 in words is "one billion, one hundred ninety-nine million, nine hundred eighty-nine thousand, nine hundred sixty-one".