1220010491 has 16 divisors (see below), whose sum is σ = 1510654464. Its totient is φ = 961317504.

The previous prime is 1220010481. The next prime is 1220010497. The reversal of 1220010491 is 1940100221.

1220010491 = T₄₉₀ + T₄₉₁ + ... + T₁₉₅₁.

It is a de Polignac number, because none of the positive numbers 2^k-1220010491 is a prime.

It is a super-3 number, since 3×1220010491³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220010497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114095 + ... + 124328.

It is an arithmetic number, because the mean of its divisors is an integer number (94415904).

Almost surely, 2^1220010491 is an apocalyptic number.

1220010491 is a deficient number, since it is larger than the sum of its proper divisors (290643973).

1220010491 is a wasteful number, since it uses less digits than its factorization.

1220010491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238490.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1220010491 is about 34928.6485710512. The cubic root of 1220010491 is about 1068.5327929667.

The spelling of 1220010491 in words is "one billion, two hundred twenty million, ten thousand, four hundred ninety-one".