1145621 has 2 divisors, whose sum is σ = 1145622. Its totient is φ = 1145620.

The previous prime is 1145611. The next prime is 1145623. The reversal of 1145621 is 1265411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662596 + 483025 = 814^2 + 695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1145621 is a prime.

Together with 1145623, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1145593 and 1145602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145623) 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, 572810 + 572811.

It is an arithmetic number, because the mean of its divisors is an integer number (572811).

2^1145621 is an apocalyptic number.

It is an amenable number.

1145621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145621 is an equidigital number, since it uses as much as digits as its factorization.

1145621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 1145621 is about 1070.3368628614. The cubic root of 1145621 is about 104.6358055164.

The spelling of 1145621 in words is "one million, one hundred forty-five thousand, six hundred twenty-one".