1620134429 has 4 divisors (see below), whose sum is σ = 1663921884. Its totient is φ = 1576346976.

The previous prime is 1620134413. The next prime is 1620134473. The reversal of 1620134429 is 9244310261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9244310261 = 107 ⋅86395423.

It can be written as a sum of positive squares in 2 ways, for example, as 1144807225 + 475327204 = 33835^2 + 21802^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620134429 - 2⁴ = 1620134413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1620134395 and 1620134404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620134489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21893672 + ... + 21893745.

It is an arithmetic number, because the mean of its divisors is an integer number (415980471).

Almost surely, 2^1620134429 is an apocalyptic number.

It is an amenable number.

1620134429 is a deficient number, since it is larger than the sum of its proper divisors (43787455).

1620134429 is an equidigital number, since it uses as much as digits as its factorization.

1620134429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43787454.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 1620134429 is about 40250.8935180326. The cubic root of 1620134429 is about 1174.4927773621.

The spelling of 1620134429 in words is "one billion, six hundred twenty million, one hundred thirty-four thousand, four hundred twenty-nine".