1251616423 has 4 divisors (see below), whose sum is σ = 1294775640. Its totient is φ = 1208457208.

The previous prime is 1251616411. The next prime is 1251616477. The reversal of 1251616423 is 3246161521.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1251616423 - 2⁵ = 1251616391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251614423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21579565 + ... + 21579622.

It is an arithmetic number, because the mean of its divisors is an integer number (323693910).

Almost surely, 2^1251616423 is an apocalyptic number.

1251616423 is a deficient number, since it is larger than the sum of its proper divisors (43159217).

1251616423 is an equidigital number, since it uses as much as digits as its factorization.

1251616423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43159216.

The product of its digits is 8640, while the sum is 31.

The square root of 1251616423 is about 35378.1913472128. The cubic root of 1251616423 is about 1077.6814753831.

Adding to 1251616423 its reverse (3246161521), we get a palindrome (4497777944).

The spelling of 1251616423 in words is "one billion, two hundred fifty-one million, six hundred sixteen thousand, four hundred twenty-three".