2102551 has 4 divisors (see below), whose sum is σ = 2293704. Its totient is φ = 1911400.

The previous prime is 2102549. The next prime is 2102557. The reversal of 2102551 is 1552012.

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 2102551 - 2¹ = 2102549 is a prime.

It is a Duffinian number.

2102551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102557) 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, 95560 + ... + 95581.

It is an arithmetic number, because the mean of its divisors is an integer number (573426).

2^2102551 is an apocalyptic number.

2102551 is a deficient number, since it is larger than the sum of its proper divisors (191153).

2102551 is a wasteful number, since it uses less digits than its factorization.

2102551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191152.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 2102551 is about 1450.0175861003. The cubic root of 2102551 is about 128.1097488093.

Adding to 2102551 its reverse (1552012), we get a palindrome (3654563).

The spelling of 2102551 in words is "two million, one hundred two thousand, five hundred fifty-one".