945872261 has 4 divisors (see below), whose sum is σ = 946156224. Its totient is φ = 945588300.

The previous prime is 945872237. The next prime is 945872297. The reversal of 945872261 is 162278549.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 162278549 = 17 ⋅9545797.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-945872261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (945872761) 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, 136925 + ... + 143666.

It is an arithmetic number, because the mean of its divisors is an integer number (236539056).

Almost surely, 2^945872261 is an apocalyptic number.

It is an amenable number.

945872261 is a deficient number, since it is larger than the sum of its proper divisors (283963).

945872261 is a wasteful number, since it uses less digits than its factorization.

945872261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283962.

The product of its digits is 241920, while the sum is 44.

The square root of 945872261 is about 30755.0363517912. The cubic root of 945872261 is about 981.6217286283.

The spelling of 945872261 in words is "nine hundred forty-five million, eight hundred seventy-two thousand, two hundred sixty-one".