2157511 has 2 divisors, whose sum is σ = 2157512. Its totient is φ = 2157510.

The previous prime is 2157503. The next prime is 2157517. The reversal of 2157511 is 1157512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2157511 - 2³ = 2157503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078755 + 1078756.

It is an arithmetic number, because the mean of its divisors is an integer number (1078756).

2^2157511 is an apocalyptic number.

2157511 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157511 is an equidigital number, since it uses as much as digits as its factorization.

2157511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 350, while the sum is 22.

The square root of 2157511 is about 1468.8468265956. The cubic root of 2157511 is about 129.2164105780.

Subtracting from 2157511 its reverse (1157512), we obtain a palindrome (999999).

The spelling of 2157511 in words is "two million, one hundred fifty-seven thousand, five hundred eleven".