1225221657 has 8 divisors (see below), whose sum is σ = 1782140640. Its totient is φ = 742558560.

The previous prime is 1225221629. The next prime is 1225221689. The reversal of 1225221657 is 7561225221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1225221657 - 2¹¹ = 1225219609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 37127929 = 1225221657 / (1 + 2 + 2 + 5 + 2 + 2 + 1 + 6 + 5 + 7).

It is not an unprimeable number, because it can be changed into a prime (1225221157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18563932 + ... + 18563997.

It is an arithmetic number, because the mean of its divisors is an integer number (222767580).

Almost surely, 2^1225221657 is an apocalyptic number.

It is an amenable number.

1225221657 is a deficient number, since it is larger than the sum of its proper divisors (556918983).

1225221657 is a wasteful number, since it uses less digits than its factorization.

1225221657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37127943.

The product of its digits is 16800, while the sum is 33.

The square root of 1225221657 is about 35003.1663853429. The cubic root of 1225221657 is about 1070.0520127859.

Adding to 1225221657 its reverse (7561225221), we get a palindrome (8786446878).

The spelling of 1225221657 in words is "one billion, two hundred twenty-five million, two hundred twenty-one thousand, six hundred fifty-seven".