1621752079 has 2 divisors, whose sum is σ = 1621752080. Its totient is φ = 1621752078.

The previous prime is 1621752071. The next prime is 1621752091. The reversal of 1621752079 is 9702571261.

It is a weak prime.

It is an emirp because it is prime and its reverse (9702571261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1621752079 - 2³ = 1621752071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621752071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810876039 + 810876040.

It is an arithmetic number, because the mean of its divisors is an integer number (810876040).

Almost surely, 2^1621752079 is an apocalyptic number.

1621752079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621752079 is an equidigital number, since it uses as much as digits as its factorization.

1621752079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 1621752079 is about 40270.9830895646. The cubic root of 1621752079 is about 1174.8835445773.

The spelling of 1621752079 in words is "one billion, six hundred twenty-one million, seven hundred fifty-two thousand, seventy-nine".