1002551 has 4 divisors (see below), whose sum is σ = 1093704. Its totient is φ = 911400.

The previous prime is 1002527. The next prime is 1002553. The reversal of 1002551 is 1552001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1002551 - 2⁶ = 1002487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002553) 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, 45560 + ... + 45581.

It is an arithmetic number, because the mean of its divisors is an integer number (273426).

2^1002551 is an apocalyptic number.

1002551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1002551 is a deficient number, since it is larger than the sum of its proper divisors (91153).

1002551 is an equidigital number, since it uses as much as digits as its factorization.

1002551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91152.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 1002551 is about 1001.2746875858. The cubic root of 1002551 is about 100.0849611290.

Adding to 1002551 its reverse (1552001), we get a palindrome (2554552).

The spelling of 1002551 in words is "one million, two thousand, five hundred fifty-one".