1620425041 has 4 divisors (see below), whose sum is σ = 1620543472. Its totient is φ = 1620306612.

The previous prime is 1620425033. The next prime is 1620425069. The reversal of 1620425041 is 1405240261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1620425041 - 2³ = 1620425033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1620424997 and 1620425015.

It is not an unprimeable number, because it can be changed into a prime (1620425641) 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, 35535 + ... + 67108.

It is an arithmetic number, because the mean of its divisors is an integer number (405135868).

Almost surely, 2^1620425041 is an apocalyptic number.

It is an amenable number.

1620425041 is a deficient number, since it is larger than the sum of its proper divisors (118431).

1620425041 is a wasteful number, since it uses less digits than its factorization.

1620425041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118430.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1620425041 is about 40254.5033629779. The cubic root of 1620425041 is about 1174.5629981378.

The spelling of 1620425041 in words is "one billion, six hundred twenty million, four hundred twenty-five thousand, forty-one".