2101551 has 8 divisors (see below), whose sum is σ = 2808960. Its totient is φ = 1397592.

The previous prime is 2101549. The next prime is 2101553. The reversal of 2101551 is 1551012.

It is an interprime number because it is at equal distance from previous prime (2101549) and next prime (2101553).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101551 - 2¹ = 2101549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2101551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1446 + ... + 2508.

It is an arithmetic number, because the mean of its divisors is an integer number (351120).

2^2101551 is an apocalyptic number.

2101551 is a deficient number, since it is larger than the sum of its proper divisors (707409).

2101551 is a wasteful number, since it uses less digits than its factorization.

2101551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 2101551 is about 1449.6727216858. The cubic root of 2101551 is about 128.0894353798.

Adding to 2101551 its reverse (1551012), we get a palindrome (3652563).

The spelling of 2101551 in words is "two million, one hundred one thousand, five hundred fifty-one".