1220955281 has 16 divisors (see below), whose sum is σ = 1503801600. Its totient is φ = 965331648.

The previous prime is 1220955269. The next prime is 1220955293. The reversal of 1220955281 is 1825590221.

It is an interprime number because it is at equal distance from previous prime (1220955269) and next prime (1220955293).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220955281 is a prime.

It is a super-2 number, since 2×1220955281² = 2981463596403577922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220955221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147860 + ... + 155898.

It is an arithmetic number, because the mean of its divisors is an integer number (93987600).

Almost surely, 2^1220955281 is an apocalyptic number.

It is an amenable number.

1220955281 is a deficient number, since it is larger than the sum of its proper divisors (282846319).

1220955281 is a wasteful number, since it uses less digits than its factorization.

1220955281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9728.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 1220955281 is about 34942.1705250261. The cubic root of 1220955281 is about 1068.8085497785.

The spelling of 1220955281 in words is "one billion, two hundred twenty million, nine hundred fifty-five thousand, two hundred eighty-one".