1225231655 has 16 divisors (see below), whose sum is σ = 1478983968. Its totient is φ = 974400000.

The previous prime is 1225231639. The next prime is 1225231681. The reversal of 1225231655 is 5561325221.

It is not a de Polignac number, because 1225231655 - 2⁴ = 1225231639 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 15 ways as a sum of consecutive naturals, for example, 843680 + ... + 845130.

It is an arithmetic number, because the mean of its divisors is an integer number (92436498).

Almost surely, 2^1225231655 is an apocalyptic number.

1225231655 is a deficient number, since it is larger than the sum of its proper divisors (253752313).

1225231655 is a wasteful number, since it uses less digits than its factorization.

1225231655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338.

The product of its digits is 18000, while the sum is 32.

The square root of 1225231655 is about 35003.3092007027. The cubic root of 1225231655 is about 1070.0549233751.

Adding to 1225231655 its reverse (5561325221), we get a palindrome (6786556876).

The spelling of 1225231655 in words is "one billion, two hundred twenty-five million, two hundred thirty-one thousand, six hundred fifty-five".