1213225357 has 4 divisors (see below), whose sum is σ = 1228582720. Its totient is φ = 1197867996.

The previous prime is 1213225337. The next prime is 1213225379. The reversal of 1213225357 is 7535223121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213225357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213225327) 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, 7678563 + ... + 7678720.

It is an arithmetic number, because the mean of its divisors is an integer number (307145680).

Almost surely, 2^1213225357 is an apocalyptic number.

It is an amenable number.

1213225357 is a deficient number, since it is larger than the sum of its proper divisors (15357363).

1213225357 is an equidigital number, since it uses as much as digits as its factorization.

1213225357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15357362.

The product of its digits is 12600, while the sum is 31.

The square root of 1213225357 is about 34831.3846552215. The cubic root of 1213225357 is about 1066.5482142662.

Adding to 1213225357 its reverse (7535223121), we get a palindrome (8748448478).

The spelling of 1213225357 in words is "one billion, two hundred thirteen million, two hundred twenty-five thousand, three hundred fifty-seven".