2811957097 has 4 divisors (see below), whose sum is σ = 2977366356. Its totient is φ = 2646547840.

The previous prime is 2811957091. The next prime is 2811957167. The reversal of 2811957097 is 7907591182.

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 1143724761 + 1668232336 = 33819^2 + 40844^2 .

It is a cyclic number.

It is not a de Polignac number, because 2811957097 - 2¹¹ = 2811955049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2811957097.

It is not an unprimeable number, because it can be changed into a prime (2811957091) 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, 82704604 + ... + 82704637.

It is an arithmetic number, because the mean of its divisors is an integer number (744341589).

Almost surely, 2^2811957097 is an apocalyptic number.

It is an amenable number.

2811957097 is a deficient number, since it is larger than the sum of its proper divisors (165409259).

2811957097 is a wasteful number, since it uses less digits than its factorization.

2811957097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165409258.

The product of its (nonzero) digits is 317520, while the sum is 49.

The square root of 2811957097 is about 53027.8898033855. The cubic root of 2811957097 is about 1411.4632123598.

The spelling of 2811957097 in words is "two billion, eight hundred eleven million, nine hundred fifty-seven thousand, ninety-seven".