1225251215 has 4 divisors (see below), whose sum is σ = 1470301464. Its totient is φ = 980200968.

The previous prime is 1225251187. The next prime is 1225251227. The reversal of 1225251215 is 5121525221.

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 1225251215 - 2⁶ = 1225251151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122525117 + ... + 122525126.

It is an arithmetic number, because the mean of its divisors is an integer number (367575366).

Almost surely, 2^1225251215 is an apocalyptic number.

1225251215 is a deficient number, since it is larger than the sum of its proper divisors (245050249).

1225251215 is an equidigital number, since it uses as much as digits as its factorization.

1225251215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245050248.

The product of its digits is 2000, while the sum is 26.

The square root of 1225251215 is about 35003.5886017420. The cubic root of 1225251215 is about 1070.0606175808.

Adding to 1225251215 its reverse (5121525221), we get a palindrome (6346776436).

The spelling of 1225251215 in words is "one billion, two hundred twenty-five million, two hundred fifty-one thousand, two hundred fifteen".