2100551 has 2 divisors, whose sum is σ = 2100552. Its totient is φ = 2100550.

The previous prime is 2100541. The next prime is 2100559. The reversal of 2100551 is 1550012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2100551 - 2⁶ = 2100487 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050275 + 1050276.

It is an arithmetic number, because the mean of its divisors is an integer number (1050276).

2^2100551 is an apocalyptic number.

2100551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100551 is an equidigital number, since it uses as much as digits as its factorization.

2100551 is an evil number, because the sum of its binary digits is even.

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

The square root of 2100551 is about 1449.3277752117. The cubic root of 2100551 is about 128.0691155054.

Adding to 2100551 its reverse (1550012), we get a palindrome (3650563).

It can be divided in two parts, 2 and 100551, that multiplied together give a palindrome (201102).

The spelling of 2100551 in words is "two million, one hundred thousand, five hundred fifty-one".