1621199429 has 2 divisors, whose sum is σ = 1621199430. Its totient is φ = 1621199428.

The previous prime is 1621199399. The next prime is 1621199473. The reversal of 1621199429 is 9249911261.

It is an a-pointer prime, because the next prime (1621199473) can be obtained adding 1621199429 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1072562500 + 548636929 = 32750^2 + 23423^2 .

It is an emirp because it is prime and its reverse (9249911261) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621199429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1621199429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621199329) 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, 810599714 + 810599715.

It is an arithmetic number, because the mean of its divisors is an integer number (810599715).

Almost surely, 2^1621199429 is an apocalyptic number.

It is an amenable number.

1621199429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621199429 is an equidigital number, since it uses as much as digits as its factorization.

1621199429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 1621199429 is about 40264.1208646110. The cubic root of 1621199429 is about 1174.7500730543.

The spelling of 1621199429 in words is "one billion, six hundred twenty-one million, one hundred ninety-nine thousand, four hundred twenty-nine".