101854807609 has 3 divisors (see below), whose sum is σ = 101855126757. Its totient is φ = 101854488462.

The previous prime is 101854807583. The next prime is 101854807633. The reversal of 101854807609 is 906708458101.

The square root of 101854807609 is 319147.

It is a perfect power (a square), and thus also a powerful number.

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 de Polignac number, because none of the positive numbers 2^k-101854807609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101854807409) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 159574 + ... + 478720.

It is an arithmetic number, because the mean of its divisors is an integer number (33951708919).

Almost surely, 2^101854807609 is an apocalyptic number.

101854807609 is the 319147-th square number.

101854807609 is the 159574-th centered octagonal number.

It is an amenable number.

101854807609 is a deficient number, since it is larger than the sum of its proper divisors (319148).

101854807609 is an frugal number, since it uses more digits than its factorization.

101854807609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638294 (or 319147 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

Multiplying 101854807609 by its sum of digits (49), we get a square (4990885572841 = 2234029²).

The spelling of 101854807609 in words is "one hundred one billion, eight hundred fifty-four million, eight hundred seven thousand, six hundred nine".