1225085881 has 4 divisors (see below), whose sum is σ = 1226016000. Its totient is φ = 1224155764.

The previous prime is 1225085861. The next prime is 1225085899. The reversal of 1225085881 is 1885805221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1225085881 - 2¹¹ = 1225083833 is a prime.

It is a super-2 number, since 2×1225085881² = 3001670831651092322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225085861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463081 + ... + 465718.

It is an arithmetic number, because the mean of its divisors is an integer number (306504000).

Almost surely, 2^1225085881 is an apocalyptic number.

It is an amenable number.

1225085881 is a deficient number, since it is larger than the sum of its proper divisors (930119).

1225085881 is an equidigital number, since it uses as much as digits as its factorization.

1225085881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930118.

The product of its (nonzero) digits is 51200, while the sum is 40.

The square root of 1225085881 is about 35001.2268499263. The cubic root of 1225085881 is about 1070.0124844964.

The spelling of 1225085881 in words is "one billion, two hundred twenty-five million, eighty-five thousand, eight hundred eighty-one".