1231854961 has 2 divisors, whose sum is σ = 1231854962. Its totient is φ = 1231854960.

The previous prime is 1231854947. The next prime is 1231854997. The reversal of 1231854961 is 1694581321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1098591025 + 133263936 = 33145^2 + 11544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231854961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231854761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615927480 + 615927481.

It is an arithmetic number, because the mean of its divisors is an integer number (615927481).

Almost surely, 2^1231854961 is an apocalyptic number.

It is an amenable number.

1231854961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231854961 is an equidigital number, since it uses as much as digits as its factorization.

1231854961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 1231854961 is about 35097.7913977504. The cubic root of 1231854961 is about 1071.9796121025.

The spelling of 1231854961 in words is "one billion, two hundred thirty-one million, eight hundred fifty-four thousand, nine hundred sixty-one".