2113720903 has 6 divisors (see below), whose sum is σ = 2415820056. Its totient is φ = 1811656512.

The previous prime is 2113720901. The next prime is 2113720933. The reversal of 2113720903 is 3090273112.

It is not a de Polignac number, because 2113720903 - 2¹ = 2113720901 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 (2113720901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112951 + ... + 130327.

It is an arithmetic number, because the mean of its divisors is an integer number (402636676).

Almost surely, 2^2113720903 is an apocalyptic number.

2113720903 is a deficient number, since it is larger than the sum of its proper divisors (302099153).

2113720903 is an frugal number, since it uses more digits than its factorization.

2113720903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34761 (or 17384 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 2113720903 is about 45975.2205323694. The cubic root of 2113720903 is about 1283.3621131156.

Multiplying 2113720903 by its sum of digits (28), we get a square (59184185284 = 243278²).

Multiplying 2113720903 by its product of nonzero digits (2268), we get a square (4793919008004 = 2189502²).

The spelling of 2113720903 in words is "two billion, one hundred thirteen million, seven hundred twenty thousand, nine hundred three".