1213425251 has 2 divisors, whose sum is σ = 1213425252. Its totient is φ = 1213425250.

The previous prime is 1213425229. The next prime is 1213425319. The reversal of 1213425251 is 1525243121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213425251 - 2²² = 1209230947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213425251.

It is not a weakly prime, because it can be changed into another prime (1213425751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606712625 + 606712626.

It is an arithmetic number, because the mean of its divisors is an integer number (606712626).

Almost surely, 2^1213425251 is an apocalyptic number.

1213425251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213425251 is an equidigital number, since it uses as much as digits as its factorization.

1213425251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 26.

The square root of 1213425251 is about 34834.2539894283. The cubic root of 1213425251 is about 1066.6067867536.

Adding to 1213425251 its reverse (1525243121), we get a palindrome (2738668372).

The spelling of 1213425251 in words is "one billion, two hundred thirteen million, four hundred twenty-five thousand, two hundred fifty-one".