2159551 has 2 divisors, whose sum is σ = 2159552. Its totient is φ = 2159550.

The previous prime is 2159537. The next prime is 2159557. The reversal of 2159551 is 1559512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2159551 - 2⁵ = 2159519 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2159557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079775 + 1079776.

It is an arithmetic number, because the mean of its divisors is an integer number (1079776).

2^2159551 is an apocalyptic number.

2159551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2159551 is an equidigital number, since it uses as much as digits as its factorization.

2159551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2250, while the sum is 28.

The square root of 2159551 is about 1469.5410848289. The cubic root of 2159551 is about 129.2571239185.

It can be divided in two parts, 21 and 59551, that multiplied together give a triangular number (1250571 = T₁₅₈₁).

The spelling of 2159551 in words is "two million, one hundred fifty-nine thousand, five hundred fifty-one".