820238101 has 4 divisors (see below), whose sum is σ = 821250304. Its totient is φ = 819225900.

The previous prime is 820238099. The next prime is 820238137. The reversal of 820238101 is 101832028.

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 820238101 - 2¹ = 820238099 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 (820238161) 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, 504885 + ... + 506506.

It is an arithmetic number, because the mean of its divisors is an integer number (205312576).

Almost surely, 2^820238101 is an apocalyptic number.

It is an amenable number.

820238101 is a deficient number, since it is larger than the sum of its proper divisors (1012203).

820238101 is a wasteful number, since it uses less digits than its factorization.

820238101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012202.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 820238101 is about 28639.7992485981. The cubic root of 820238101 is about 936.0807471217.

The spelling of 820238101 in words is "eight hundred twenty million, two hundred thirty-eight thousand, one hundred one".