1006455491 has 4 divisors (see below), whose sum is σ = 1007561184. Its totient is φ = 1005349800.

The previous prime is 1006455487. The next prime is 1006455503. The reversal of 1006455491 is 1945546001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1945546001 = 7 ⋅277935143.

It is a cyclic number.

It is not a de Polignac number, because 1006455491 - 2² = 1006455487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1006455451) 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 3 ways as a sum of consecutive naturals, for example, 551480 + ... + 553301.

It is an arithmetic number, because the mean of its divisors is an integer number (251890296).

Almost surely, 2^1006455491 is an apocalyptic number.

1006455491 is a deficient number, since it is larger than the sum of its proper divisors (1105693).

1006455491 is an equidigital number, since it uses as much as digits as its factorization.

1006455491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105692.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 1006455491 is about 31724.6826776880. The cubic root of 1006455491 is about 1002.1472164947.

The spelling of 1006455491 in words is "one billion, six million, four hundred fifty-five thousand, four hundred ninety-one".