1231223401 has 2 divisors, whose sum is σ = 1231223402. Its totient is φ = 1231223400.

The previous prime is 1231223393. The next prime is 1231223417. The reversal of 1231223401 is 1043221321.

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., 801739225 + 429484176 = 28315^2 + 20724^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231223401 - 2³ = 1231223393 is a prime.

It is a super-2 number, since 2×1231223401² = 3031822126340013602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231223701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615611700 + 615611701.

It is an arithmetic number, because the mean of its divisors is an integer number (615611701).

Almost surely, 2^1231223401 is an apocalyptic number.

It is an amenable number.

1231223401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231223401 is an equidigital number, since it uses as much as digits as its factorization.

1231223401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1231223401 is about 35088.7930969419. The cubic root of 1231223401 is about 1071.7963829620.

Adding to 1231223401 its reverse (1043221321), we get a palindrome (2274444722).

The spelling of 1231223401 in words is "one billion, two hundred thirty-one million, two hundred twenty-three thousand, four hundred one".