1012109491 has 8 divisors (see below), whose sum is σ = 1015432704. Its totient is φ = 1008792840.

The previous prime is 1012109489. The next prime is 1012109561. The reversal of 1012109491 is 1949012101.

1012109491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1012109491 - 2¹ = 1012109489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012109401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629010 + ... + 630616.

It is an arithmetic number, because the mean of its divisors is an integer number (126929088).

Almost surely, 2^1012109491 is an apocalyptic number.

1012109491 is a deficient number, since it is larger than the sum of its proper divisors (3323213).

1012109491 is a wasteful number, since it uses less digits than its factorization.

1012109491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1012109491 is about 31813.6683046768. The cubic root of 1012109491 is about 1004.0203124280.

The spelling of 1012109491 in words is "one billion, twelve million, one hundred nine thousand, four hundred ninety-one".