1189237961 has 2 divisors, whose sum is σ = 1189237962. Its totient is φ = 1189237960.

The previous prime is 1189237957. The next prime is 1189237981. The reversal of 1189237961 is 1697329811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1188525625 + 712336 = 34475^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189237961 - 2² = 1189237957 is a prime.

It is not a weakly prime, because it can be changed into another prime (1189237901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594618980 + 594618981.

It is an arithmetic number, because the mean of its divisors is an integer number (594618981).

Almost surely, 2^1189237961 is an apocalyptic number.

It is an amenable number.

1189237961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189237961 is an equidigital number, since it uses as much as digits as its factorization.

1189237961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 1189237961 is about 34485.3296489971. The cubic root of 1189237961 is about 1059.4722544999.

The spelling of 1189237961 in words is "one billion, one hundred eighty-nine million, two hundred thirty-seven thousand, nine hundred sixty-one".