1645234537 has 2 divisors, whose sum is σ = 1645234538. Its totient is φ = 1645234536.

The previous prime is 1645234531. The next prime is 1645234541. The reversal of 1645234537 is 7354325461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1030987881 + 614246656 = 32109^2 + 24784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645234537 - 2¹⁵ = 1645201769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645234537.

It is not a weakly prime, because it can be changed into another prime (1645234531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822617268 + 822617269.

It is an arithmetic number, because the mean of its divisors is an integer number (822617269).

Almost surely, 2^1645234537 is an apocalyptic number.

It is an amenable number.

1645234537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645234537 is an equidigital number, since it uses as much as digits as its factorization.

1645234537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 40.

The square root of 1645234537 is about 40561.4908133318. The cubic root of 1645234537 is about 1180.5270404917.

Adding to 1645234537 its reverse (7354325461), we get a palindrome (8999559998).

The spelling of 1645234537 in words is "one billion, six hundred forty-five million, two hundred thirty-four thousand, five hundred thirty-seven".