1972591 has 2 divisors, whose sum is σ = 1972592. Its totient is φ = 1972590.

The previous prime is 1972589. The next prime is 1972603. The reversal of 1972591 is 1952791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1972591 - 2¹ = 1972589 is a prime.

It is a super-2 number, since 2×1972591² = 7782230506562, which contains 22 as substring.

Together with 1972589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1972511) 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, 986295 + 986296.

It is an arithmetic number, because the mean of its divisors is an integer number (986296).

2^1972591 is an apocalyptic number.

1972591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972591 is an equidigital number, since it uses as much as digits as its factorization.

1972591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 34.

The square root of 1972591 is about 1404.4895870031. The cubic root of 1972591 is about 125.4139026309.

The spelling of 1972591 in words is "one million, nine hundred seventy-two thousand, five hundred ninety-one".