1623542489 has 2 divisors, whose sum is σ = 1623542490. Its totient is φ = 1623542488.

The previous prime is 1623542461. The next prime is 1623542491. The reversal of 1623542489 is 9842453261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1126609225 + 496933264 = 33565^2 + 22292^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623542489 - 2²⁰ = 1622493913 is a prime.

Together with 1623542491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1623542189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811771244 + 811771245.

It is an arithmetic number, because the mean of its divisors is an integer number (811771245).

Almost surely, 2^1623542489 is an apocalyptic number.

It is an amenable number.

1623542489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623542489 is an equidigital number, since it uses as much as digits as its factorization.

1623542489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 44.

The square root of 1623542489 is about 40293.2064869501. The cubic root of 1623542489 is about 1175.3157416753.

The spelling of 1623542489 in words is "one billion, six hundred twenty-three million, five hundred forty-two thousand, four hundred eighty-nine".