1231961 has 2 divisors, whose sum is σ = 1231962. Its totient is φ = 1231960.

The previous prime is 1231943. The next prime is 1231981. The reversal of 1231961 is 1691321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1038361 + 193600 = 1019^2 + 440^2 .

It is an emirp because it is prime and its reverse (1691321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1231981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615980 + 615981.

It is an arithmetic number, because the mean of its divisors is an integer number (615981).

2^1231961 is an apocalyptic number.

It is an amenable number.

1231961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231961 is an equidigital number, since it uses as much as digits as its factorization.

1231961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 1231961 is about 1109.9373856214. The cubic root of 1231961 is about 107.2010370157.

The spelling of 1231961 in words is "one million, two hundred thirty-one thousand, nine hundred sixty-one".