1220735831 has 16 divisors (see below), whose sum is σ = 1445601600. Its totient is φ = 1008607488.

The previous prime is 1220735827. The next prime is 1220735839. The reversal of 1220735831 is 1385370221.

It is not a de Polignac number, because 1220735831 - 2² = 1220735827 is a prime.

It is a super-2 number, since 2×1220735831² = 2980391938174521122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220735839) 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, 127955 + ... + 137163.

It is an arithmetic number, because the mean of its divisors is an integer number (90350100).

Almost surely, 2^1220735831 is an apocalyptic number.

1220735831 is a deficient number, since it is larger than the sum of its proper divisors (224865769).

1220735831 is an equidigital number, since it uses as much as digits as its factorization.

1220735831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9898.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1220735831 is about 34939.0301954705. The cubic root of 1220735831 is about 1068.7445113725.

The spelling of 1220735831 in words is "one billion, two hundred twenty million, seven hundred thirty-five thousand, eight hundred thirty-one".