1620042031 has 4 divisors (see below), whose sum is σ = 1620154872. Its totient is φ = 1619929192.

The previous prime is 1620041999. The next prime is 1620042037. The reversal of 1620042031 is 1302400261.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1620042031 - 2⁵ = 1620041999 is a prime.

It is a super-2 number, since 2×1620042031² = 5249072364413209922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620042037) 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, 31096 + ... + 64861.

It is an arithmetic number, because the mean of its divisors is an integer number (405038718).

Almost surely, 2^1620042031 is an apocalyptic number.

1620042031 is a deficient number, since it is larger than the sum of its proper divisors (112841).

1620042031 is an equidigital number, since it uses as much as digits as its factorization.

1620042031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112840.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1620042031 is about 40249.7457259049. The cubic root of 1620042031 is about 1174.4704494111.

Adding to 1620042031 its reverse (1302400261), we get a palindrome (2922442292).

The spelling of 1620042031 in words is "one billion, six hundred twenty million, forty-two thousand, thirty-one".