1225605158 has 4 divisors (see below), whose sum is σ = 1838407740. Its totient is φ = 612802578.

The previous prime is 1225605091. The next prime is 1225605211. The reversal of 1225605158 is 8515065221.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306401288 + ... + 306401291.

It is an arithmetic number, because the mean of its divisors is an integer number (459601935).

Almost surely, 2^1225605158 is an apocalyptic number.

1225605158 is a deficient number, since it is larger than the sum of its proper divisors (612802582).

1225605158 is an equidigital number, since it uses as much as digits as its factorization.

1225605158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612802581.

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 1225605158 is about 35008.6440468636. The cubic root of 1225605158 is about 1070.1636451605.

The spelling of 1225605158 in words is "one billion, two hundred twenty-five million, six hundred five thousand, one hundred fifty-eight".