1620158983 has 4 divisors (see below), whose sum is σ = 1672422208. Its totient is φ = 1567895760.

The previous prime is 1620158977. The next prime is 1620158987. The reversal of 1620158983 is 3898510261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620158983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620158987) 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, 26131566 + ... + 26131627.

It is an arithmetic number, because the mean of its divisors is an integer number (418105552).

Almost surely, 2^1620158983 is an apocalyptic number.

1620158983 is a deficient number, since it is larger than the sum of its proper divisors (52263225).

1620158983 is an equidigital number, since it uses as much as digits as its factorization.

1620158983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52263224.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 1620158983 is about 40251.1985287395. The cubic root of 1620158983 is about 1174.4987106867.

The spelling of 1620158983 in words is "one billion, six hundred twenty million, one hundred fifty-eight thousand, nine hundred eighty-three".