2116631554 has 4 divisors (see below), whose sum is σ = 3174947334. Its totient is φ = 1058315776.

The previous prime is 2116631551. The next prime is 2116631567. The reversal of 2116631554 is 4551366112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1250683225 + 865948329 = 35365^2 + 29427^2 .

It is not an unprimeable number, because it can be changed into a prime (2116631551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 529157887 + ... + 529157890.

Almost surely, 2^2116631554 is an apocalyptic number.

2116631554 is a deficient number, since it is larger than the sum of its proper divisors (1058315780).

2116631554 is a wasteful number, since it uses less digits than its factorization.

2116631554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058315779.

The product of its digits is 21600, while the sum is 34.

The square root of 2116631554 is about 46006.8642052466. The cubic root of 2116631554 is about 1283.9509177416.

Adding to 2116631554 its reverse (4551366112), we get a palindrome (6667997666).

The spelling of 2116631554 in words is "two billion, one hundred sixteen million, six hundred thirty-one thousand, five hundred fifty-four".