1225131985 has 32 divisors (see below), whose sum is σ = 1843156224. Its totient is φ = 759456000.

The previous prime is 1225131977. The next prime is 1225132001. The reversal of 1225131985 is 5891315221.

It is not a de Polignac number, because 1225131985 - 2³ = 1225131977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60895 + ... + 78475.

It is an arithmetic number, because the mean of its divisors is an integer number (57598632).

Almost surely, 2^1225131985 is an apocalyptic number.

It is an amenable number.

1225131985 is a deficient number, since it is larger than the sum of its proper divisors (618024239).

1225131985 is a wasteful number, since it uses less digits than its factorization.

1225131985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17785.

The product of its digits is 21600, while the sum is 37.

The square root of 1225131985 is about 35001.8854492154. The cubic root of 1225131985 is about 1070.0259070211.

The spelling of 1225131985 in words is "one billion, two hundred twenty-five million, one hundred thirty-one thousand, nine hundred eighty-five".