1225156194 has 24 divisors (see below), whose sum is σ = 2686490352. Its totient is φ = 403464600.

The previous prime is 1225156193. The next prime is 1225156211. The reversal of 1225156194 is 4916515221.

1225156194 is a `hidden beast` number, since 1 + 2 + 2 + 5 + 1 + 561 + 94 = 666.

It is not an unprimeable number, because it can be changed into a prime (1225156193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 408532 + ... + 411519.

It is an arithmetic number, because the mean of its divisors is an integer number (111937098).

Almost surely, 2^1225156194 is an apocalyptic number.

1225156194 is an abundant number, since it is smaller than the sum of its proper divisors (1461334158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225156194 is a wasteful number, since it uses less digits than its factorization.

1225156194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820142 (or 820139 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 1225156194 is about 35002.2312717347. The cubic root of 1225156194 is about 1070.0329549928.

The spelling of 1225156194 in words is "one billion, two hundred twenty-five million, one hundred fifty-six thousand, one hundred ninety-four".