1231123402 has 4 divisors (see below), whose sum is σ = 1846685106. Its totient is φ = 615561700.

The previous prime is 1231123351. The next prime is 1231123403. The reversal of 1231123402 is 2043211321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1211666481 + 19456921 = 34809^2 + 4411^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1231123402.

It is not an unprimeable number, because it can be changed into a prime (1231123403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307780849 + ... + 307780852.

Almost surely, 2^1231123402 is an apocalyptic number.

1231123402 is a deficient number, since it is larger than the sum of its proper divisors (615561704).

1231123402 is an equidigital number, since it uses as much as digits as its factorization.

1231123402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615561703.

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

The square root of 1231123402 is about 35087.3681258655. The cubic root of 1231123402 is about 1071.7673653556.

Adding to 1231123402 its reverse (2043211321), we get a palindrome (3274334723).

The spelling of 1231123402 in words is "one billion, two hundred thirty-one million, one hundred twenty-three thousand, four hundred two".