1645132373 has 2 divisors, whose sum is σ = 1645132374. Its totient is φ = 1645132372.

The previous prime is 1645132367. The next prime is 1645132439. The reversal of 1645132373 is 3732315461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1193909809 + 451222564 = 34553^2 + 21242^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645132373 - 2¹⁸ = 1644870229 is a prime.

It is a super-2 number, since 2×1645132373² = 5412921049385222258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665132373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822566186 + 822566187.

It is an arithmetic number, because the mean of its divisors is an integer number (822566187).

Almost surely, 2^1645132373 is an apocalyptic number.

It is an amenable number.

1645132373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645132373 is an equidigital number, since it uses as much as digits as its factorization.

1645132373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 35.

The square root of 1645132373 is about 40560.2314219236. The cubic root of 1645132373 is about 1180.5026042875.

The spelling of 1645132373 in words is "one billion, six hundred forty-five million, one hundred thirty-two thousand, three hundred seventy-three".