1225510551 has 6 divisors (see below), whose sum is σ = 1770181920. Its totient is φ = 817007028.

The previous prime is 1225510543. The next prime is 1225510553. The reversal of 1225510551 is 1550155221.

1225510551 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1225510551 - 2³ = 1225510543 is a prime.

It is a super-2 number, since 2×1225510551² = 3003752221224647202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225510553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68083911 + ... + 68083928.

It is an arithmetic number, because the mean of its divisors is an integer number (295030320).

Almost surely, 2^1225510551 is an apocalyptic number.

1225510551 is a deficient number, since it is larger than the sum of its proper divisors (544671369).

1225510551 is a wasteful number, since it uses less digits than its factorization.

1225510551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136167845 (or 136167842 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The square root of 1225510551 is about 35007.2928259241. The cubic root of 1225510551 is about 1070.1361084027.

Adding to 1225510551 its reverse (1550155221), we get a palindrome (2775665772).

The spelling of 1225510551 in words is "one billion, two hundred twenty-five million, five hundred ten thousand, five hundred fifty-one".