1228567157 has 4 divisors (see below), whose sum is σ = 1244118720. Its totient is φ = 1213015596.

The previous prime is 1228567069. The next prime is 1228567163. The reversal of 1228567157 is 7517658221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7517658221 = 193 ⋅38951597.

It is a cyclic number.

It is not a de Polignac number, because 1228567157 - 2²⁴ = 1211789941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228567187) 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, 7775663 + ... + 7775820.

It is an arithmetic number, because the mean of its divisors is an integer number (311029680).

Almost surely, 2^1228567157 is an apocalyptic number.

It is an amenable number.

1228567157 is a deficient number, since it is larger than the sum of its proper divisors (15551563).

1228567157 is an equidigital number, since it uses as much as digits as its factorization.

1228567157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15551562.

The product of its digits is 235200, while the sum is 44.

The square root of 1228567157 is about 35050.9223416446. The cubic root of 1228567157 is about 1071.0250627431.

The spelling of 1228567157 in words is "one billion, two hundred twenty-eight million, five hundred sixty-seven thousand, one hundred fifty-seven".