945907861 has 4 divisors (see below), whose sum is σ = 950809132. Its totient is φ = 941006592.

The previous prime is 945907841. The next prime is 945907871. The reversal of 945907861 is 168709549.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86304100 + 859603761 = 9290^2 + 29319^2 .

It is a cyclic number.

It is not a de Polignac number, because 945907861 - 2¹⁵ = 945875093 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 (945907841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2450346 + ... + 2450731.

It is an arithmetic number, because the mean of its divisors is an integer number (237702283).

Almost surely, 2^945907861 is an apocalyptic number.

It is an amenable number.

945907861 is a deficient number, since it is larger than the sum of its proper divisors (4901271).

945907861 is a wasteful number, since it uses less digits than its factorization.

945907861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4901270.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 945907861 is about 30755.6151133415. The cubic root of 945907861 is about 981.6340436440.

The spelling of 945907861 in words is "nine hundred forty-five million, nine hundred seven thousand, eight hundred sixty-one".