1213423251 has 8 divisors (see below), whose sum is σ = 1661624784. Its totient is φ = 787085280.

The previous prime is 1213423247. The next prime is 1213423271. The reversal of 1213423251 is 1523243121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213423251 - 2² = 1213423247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213423271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5465760 + ... + 5465981.

It is an arithmetic number, because the mean of its divisors is an integer number (207703098).

Almost surely, 2^1213423251 is an apocalyptic number.

1213423251 is a deficient number, since it is larger than the sum of its proper divisors (448201533).

1213423251 is a wasteful number, since it uses less digits than its factorization.

1213423251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10931781.

The product of its digits is 1440, while the sum is 24.

The square root of 1213423251 is about 34834.2252820412. The cubic root of 1213423251 is about 1066.6062007500.

Adding to 1213423251 its reverse (1523243121), we get a palindrome (2736666372).

The spelling of 1213423251 in words is "one billion, two hundred thirteen million, four hundred twenty-three thousand, two hundred fifty-one".