1225533187 has 2 divisors, whose sum is σ = 1225533188. Its totient is φ = 1225533186.

The previous prime is 1225533143. The next prime is 1225533223. The reversal of 1225533187 is 7813355221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225533187 is a prime.

It is not a weakly prime, because it can be changed into another prime (1225533487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612766593 + 612766594.

It is an arithmetic number, because the mean of its divisors is an integer number (612766594).

Almost surely, 2^1225533187 is an apocalyptic number.

1225533187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225533187 is an equidigital number, since it uses as much as digits as its factorization.

1225533187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 1225533187 is about 35007.6161284941. The cubic root of 1225533187 is about 1070.1426970721.

The spelling of 1225533187 in words is "one billion, two hundred twenty-five million, five hundred thirty-three thousand, one hundred eighty-seven".