2291374861 has 4 divisors (see below), whose sum is σ = 2291566300. Its totient is φ = 2291183424.

The previous prime is 2291374853. The next prime is 2291374907. The reversal of 2291374861 is 1684731922.

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 2018794761 + 272580100 = 44931^2 + 16510^2 .

It is a cyclic number.

It is not a de Polignac number, because 2291374861 - 2³ = 2291374853 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 (2291374661) 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, 76476 + ... + 102133.

It is an arithmetic number, because the mean of its divisors is an integer number (572891575).

Almost surely, 2^2291374861 is an apocalyptic number.

It is an amenable number.

2291374861 is a deficient number, since it is larger than the sum of its proper divisors (191439).

2291374861 is a wasteful number, since it uses less digits than its factorization.

2291374861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191438.

The product of its digits is 145152, while the sum is 43.

The square root of 2291374861 is about 47868.3074800018. The cubic root of 2291374861 is about 1318.3540206683.

The spelling of 2291374861 in words is "two billion, two hundred ninety-one million, three hundred seventy-four thousand, eight hundred sixty-one".