2156537 has 2 divisors, whose sum is σ = 2156538. Its totient is φ = 2156536.

The previous prime is 2156521. The next prime is 2156597. The reversal of 2156537 is 7356512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1915456 + 241081 = 1384^2 + 491^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156537 - 2⁴ = 2156521 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 5³ + 6² + 5³ + 3¹⁰ + 7² .

It is not a weakly prime, because it can be changed into another prime (2156507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078268 + 1078269.

It is an arithmetic number, because the mean of its divisors is an integer number (1078269).

2^2156537 is an apocalyptic number.

It is an amenable number.

2156537 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156537 is an equidigital number, since it uses as much as digits as its factorization.

2156537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 29.

The square root of 2156537 is about 1468.5152365570. The cubic root of 2156537 is about 129.1969629015.

The spelling of 2156537 in words is "two million, one hundred fifty-six thousand, five hundred thirty-seven".