2661231097 has 16 divisors (see below), whose sum is σ = 3096057600. Its totient is φ = 2240409600.

The previous prime is 2661231061. The next prime is 2661231109. The reversal of 2661231097 is 7901321662.

It is a cyclic number.

It is not a de Polignac number, because 2661231097 - 2³¹ = 513747449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661231037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79929 + ... + 108217.

It is an arithmetic number, because the mean of its divisors is an integer number (193503600).

Almost surely, 2^2661231097 is an apocalyptic number.

It is an amenable number.

2661231097 is a deficient number, since it is larger than the sum of its proper divisors (434826503).

2661231097 is a wasteful number, since it uses less digits than its factorization.

2661231097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28536.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 2661231097 is about 51587.1214257977. The cubic root of 2661231097 is about 1385.7797044211.

The spelling of 2661231097 in words is "two billion, six hundred sixty-one million, two hundred thirty-one thousand, ninety-seven".