2891359397 has 4 divisors (see below), whose sum is σ = 2917885740. Its totient is φ = 2864833056.

The previous prime is 2891359391. The next prime is 2891359451. The reversal of 2891359397 is 7939531982.

It is a happy number.

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 2118852961 + 772506436 = 46031^2 + 27794^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891359397 - 2¹⁰ = 2891358373 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 (2891359391) 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, 13263008 + ... + 13263225.

It is an arithmetic number, because the mean of its divisors is an integer number (729471435).

Almost surely, 2^2891359397 is an apocalyptic number.

It is an amenable number.

2891359397 is a deficient number, since it is larger than the sum of its proper divisors (26526343).

2891359397 is a wasteful number, since it uses less digits than its factorization.

2891359397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26526342.

The product of its digits is 3674160, while the sum is 56.

The square root of 2891359397 is about 53771.3622386489. The cubic root of 2891359397 is about 1424.6254309653.

The spelling of 2891359397 in words is "two billion, eight hundred ninety-one million, three hundred fifty-nine thousand, three hundred ninety-seven".