1220499791 has 18 divisors (see below), whose sum is σ = 1467097920. Its totient is φ = 1012357080.

The previous prime is 1220499737. The next prime is 1220499821. The reversal of 1220499791 is 1979940221.

It is not a de Polignac number, because 1220499791 - 2¹⁰ = 1220498767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220499391) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 34130 + ... + 60048.

It is an arithmetic number, because the mean of its divisors is an integer number (81505440).

Almost surely, 2^1220499791 is an apocalyptic number.

1220499791 is a deficient number, since it is larger than the sum of its proper divisors (246598129).

1220499791 is an equidigital number, since it uses as much as digits as its factorization.

1220499791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25995 (or 25957 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 1220499791 is about 34935.6521479133. The cubic root of 1220499791 is about 1068.6756232180.

The spelling of 1220499791 in words is "one billion, two hundred twenty million, four hundred ninety-nine thousand, seven hundred ninety-one".