731851961 has 8 divisors (see below), whose sum is σ = 738805704. Its totient is φ = 724930560.

The previous prime is 731851903. The next prime is 731851969. The reversal of 731851961 is 169158137.

It can be written as a sum of positive squares in 4 ways, for example, as 17305600 + 714546361 = 4160^2 + 26731^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 731851961 - 2²² = 727657657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731851969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38651 + ... + 54383.

It is an arithmetic number, because the mean of its divisors is an integer number (92350713).

Almost surely, 2^731851961 is an apocalyptic number.

It is an amenable number.

731851961 is a deficient number, since it is larger than the sum of its proper divisors (6953743).

731851961 is a wasteful number, since it uses less digits than its factorization.

731851961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16171.

The product of its digits is 45360, while the sum is 41.

The square root of 731851961 is about 27052.7625391567. The cubic root of 731851961 is about 901.1721193241.

The spelling of 731851961 in words is "seven hundred thirty-one million, eight hundred fifty-one thousand, nine hundred sixty-one".