1954117765 has 4 divisors (see below), whose sum is σ = 2344941324. Its totient is φ = 1563294208.

The previous prime is 1954117733. The next prime is 1954117777. The reversal of 1954117765 is 5677114591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5677114591 = 13009 ⋅436399.

It can be written as a sum of positive squares in 2 ways, for example, as 1545511969 + 408605796 = 39313^2 + 20214^2 .

It is a cyclic number.

It is not a de Polignac number, because 1954117765 - 2⁵ = 1954117733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195411772 + ... + 195411781.

It is an arithmetic number, because the mean of its divisors is an integer number (586235331).

Almost surely, 2^1954117765 is an apocalyptic number.

It is an amenable number.

1954117765 is a deficient number, since it is larger than the sum of its proper divisors (390823559).

1954117765 is an equidigital number, since it uses as much as digits as its factorization.

1954117765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390823558.

The product of its digits is 264600, while the sum is 46.

The square root of 1954117765 is about 44205.4042510641. The cubic root of 1954117765 is about 1250.2117539928.

The spelling of 1954117765 in words is "one billion, nine hundred fifty-four million, one hundred seventeen thousand, seven hundred sixty-five".