1125000491 has 4 divisors (see below), whose sum is σ = 1143443184. Its totient is φ = 1106557800.

The previous prime is 1125000463. The next prime is 1125000497. The reversal of 1125000491 is 1940005211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1940005211 = 397 ⋅4886663.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1125000491 is a prime.

It is a super-2 number, since 2×1125000491² = 2531252209500482162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125000497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9221255 + ... + 9221376.

It is an arithmetic number, because the mean of its divisors is an integer number (285860796).

Almost surely, 2^1125000491 is an apocalyptic number.

1125000491 is a deficient number, since it is larger than the sum of its proper divisors (18442693).

1125000491 is an equidigital number, since it uses as much as digits as its factorization.

1125000491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18442692.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 1125000491 is about 33541.0269818919. The cubic root of 1125000491 is about 1040.0420628328.

The spelling of 1125000491 in words is "one billion, one hundred twenty-five million, four hundred ninety-one", and thus it is an aban number.