1225638211 has 8 divisors (see below), whose sum is σ = 1424471040. Its totient is φ = 1032740808.

The previous prime is 1225638173. The next prime is 1225638221. The reversal of 1225638211 is 1128365221.

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

It is a cyclic number.

It is not a de Polignac number, because 1225638211 - 2⁷ = 1225638083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225638221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1483411 + ... + 1484236.

It is an arithmetic number, because the mean of its divisors is an integer number (178058880).

Almost surely, 2^1225638211 is an apocalyptic number.

1225638211 is a deficient number, since it is larger than the sum of its proper divisors (198832829).

1225638211 is an equidigital number, since it uses as much as digits as its factorization.

1225638211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967713.

The product of its digits is 5760, while the sum is 31.

The square root of 1225638211 is about 35009.1161128070. The cubic root of 1225638211 is about 1070.1732653879.

The spelling of 1225638211 in words is "one billion, two hundred twenty-five million, six hundred thirty-eight thousand, two hundred eleven".