1620979033 has 4 divisors (see below), whose sum is σ = 1630349028. Its totient is φ = 1611609040.

The previous prime is 1620978973. The next prime is 1620979067. The reversal of 1620979033 is 3309790261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3309790261 = 137 ⋅24159053.

It can be written as a sum of positive squares in 2 ways, for example, as 1581891529 + 39087504 = 39773^2 + 6252^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620979033 - 2²¹ = 1618881881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620979093) 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, 4684738 + ... + 4685083.

It is an arithmetic number, because the mean of its divisors is an integer number (407587257).

Almost surely, 2^1620979033 is an apocalyptic number.

It is an amenable number.

1620979033 is a deficient number, since it is larger than the sum of its proper divisors (9369995).

1620979033 is an equidigital number, since it uses as much as digits as its factorization.

1620979033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9369994.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 1620979033 is about 40261.3838932543. The cubic root of 1620979033 is about 1174.6968363486.

The spelling of 1620979033 in words is "one billion, six hundred twenty million, nine hundred seventy-nine thousand, thirty-three".