1225795491 has 32 divisors (see below), whose sum is σ = 1875148800. Its totient is φ = 790896960.

The previous prime is 1225795471. The next prime is 1225795517. The reversal of 1225795491 is 1945975221.

1225795491 is a `hidden beast` number, since 1 + 22 + 57 + 95 + 491 = 666.

It is not a de Polignac number, because 1225795491 - 2²¹ = 1223698339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225795471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136230 + ... + 144948.

It is an arithmetic number, because the mean of its divisors is an integer number (58598400).

Almost surely, 2^1225795491 is an apocalyptic number.

1225795491 is a deficient number, since it is larger than the sum of its proper divisors (649353309).

1225795491 is a wasteful number, since it uses less digits than its factorization.

1225795491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8896 (or 8890 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 1225795491 is about 35011.3623128264. The cubic root of 1225795491 is about 1070.2190400845.

The spelling of 1225795491 in words is "one billion, two hundred twenty-five million, seven hundred ninety-five thousand, four hundred ninety-one".