2101553 has 2 divisors, whose sum is σ = 2101554. Its totient is φ = 2101552.

The previous prime is 2101549. The next prime is 2101607. The reversal of 2101553 is 3551012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2093809 + 7744 = 1447^2 + 88^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101553 - 2² = 2101549 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050776 + 1050777.

It is an arithmetic number, because the mean of its divisors is an integer number (1050777).

2^2101553 is an apocalyptic number.

It is an amenable number.

2101553 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101553 is an equidigital number, since it uses as much as digits as its factorization.

2101553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 2101553 is about 1449.6734114965. The cubic root of 2101553 is about 128.0894760131.

Adding to 2101553 its reverse (3551012), we get a palindrome (5652565).

The spelling of 2101553 in words is "two million, one hundred one thousand, five hundred fifty-three".