1642245971 has 4 divisors (see below), whose sum is σ = 1642619712. Its totient is φ = 1641872232.

The previous prime is 1642245953. The next prime is 1642246007. The reversal of 1642245971 is 1795422461.

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

It is a cyclic number.

It is not a de Polignac number, because 1642245971 - 2³⁰ = 568504147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642245571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180200 + ... + 189093.

It is an arithmetic number, because the mean of its divisors is an integer number (410654928).

Almost surely, 2^1642245971 is an apocalyptic number.

1642245971 is a deficient number, since it is larger than the sum of its proper divisors (373741).

1642245971 is an equidigital number, since it uses as much as digits as its factorization.

1642245971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373740.

The product of its digits is 120960, while the sum is 41.

The square root of 1642245971 is about 40524.6341254304. The cubic root of 1642245971 is about 1179.8117987218.

The spelling of 1642245971 in words is "one billion, six hundred forty-two million, two hundred forty-five thousand, nine hundred seventy-one".