1231622993 has 2 divisors, whose sum is σ = 1231622994. Its totient is φ = 1231622992.

The previous prime is 1231622989. The next prime is 1231623017. The reversal of 1231622993 is 3992261321.

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., 1063868689 + 167754304 = 32617^2 + 12952^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231622993 - 2² = 1231622989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1231622923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615811496 + 615811497.

It is an arithmetic number, because the mean of its divisors is an integer number (615811497).

Almost surely, 2^1231622993 is an apocalyptic number.

It is an amenable number.

1231622993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231622993 is an equidigital number, since it uses as much as digits as its factorization.

1231622993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 38.

The square root of 1231622993 is about 35094.4866467655. The cubic root of 1231622993 is about 1071.9123204747.

The spelling of 1231622993 in words is "one billion, two hundred thirty-one million, six hundred twenty-two thousand, nine hundred ninety-three".