1016551 has 4 divisors (see below), whose sum is σ = 1020600. Its totient is φ = 1012504.

The previous prime is 1016527. The next prime is 1016567. The reversal of 1016551 is 1556101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1556101 = 107 ⋅14543.

It is a cyclic number.

It is not a de Polignac number, because 1016551 - 2⁷ = 1016423 is a prime.

It is a super-3 number, since 3×1016551³ = 3151438022133396453, which contains 333 as substring.

It is a Duffinian number.

1016551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1621 + ... + 2158.

It is an arithmetic number, because the mean of its divisors is an integer number (255150).

2^1016551 is an apocalyptic number.

1016551 is a deficient number, since it is larger than the sum of its proper divisors (4049).

1016551 is an equidigital number, since it uses as much as digits as its factorization.

1016551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1016551 is about 1008.2415385214. The cubic root of 1016551 is about 100.5486839531.

It can be divided in two parts, 10 and 16551, that added together give a palindrome (16561).

The spelling of 1016551 in words is "one million, sixteen thousand, five hundred fifty-one".