1225618571 has 4 divisors (see below), whose sum is σ = 1238253912. Its totient is φ = 1212983232.

The previous prime is 1225618567. The next prime is 1225618591. The reversal of 1225618571 is 1758165221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1758165221 = 31327 ⋅56123.

It is a cyclic number.

It is not a de Polignac number, because 1225618571 - 2² = 1225618567 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225618501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6317525 + ... + 6317718.

It is an arithmetic number, because the mean of its divisors is an integer number (309563478).

Almost surely, 2^1225618571 is an apocalyptic number.

1225618571 is a deficient number, since it is larger than the sum of its proper divisors (12635341).

1225618571 is an equidigital number, since it uses as much as digits as its factorization.

1225618571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12635340.

The product of its digits is 33600, while the sum is 38.

The square root of 1225618571 is about 35008.8356133134. The cubic root of 1225618571 is about 1070.1675490966.

The spelling of 1225618571 in words is "one billion, two hundred twenty-five million, six hundred eighteen thousand, five hundred seventy-one".