1621885423 has 2 divisors, whose sum is σ = 1621885424. Its totient is φ = 1621885422.

The previous prime is 1621885403. The next prime is 1621885501. The reversal of 1621885423 is 3245881261.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621885423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621885403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810942711 + 810942712.

It is an arithmetic number, because the mean of its divisors is an integer number (810942712).

Almost surely, 2^1621885423 is an apocalyptic number.

1621885423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621885423 is an equidigital number, since it uses as much as digits as its factorization.

1621885423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 40.

The square root of 1621885423 is about 40272.6386396521. The cubic root of 1621885423 is about 1174.9157441923.

The spelling of 1621885423 in words is "one billion, six hundred twenty-one million, eight hundred eighty-five thousand, four hundred twenty-three".