2511229031861 has 24 divisors (see below), whose sum is σ = 2791913621952. Its totient is φ = 2256846451200.

The previous prime is 2511229031849. The next prime is 2511229031869. The reversal of 2511229031861 is 1681309221152.

It is not a de Polignac number, because 2511229031861 - 2⁶ = 2511229031797 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 (2511229031869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7016546 + ... + 7365756.

It is an arithmetic number, because the mean of its divisors is an integer number (116329734248).

Almost surely, 2^{2511229031861} is an apocalyptic number.

It is an amenable number.

2511229031861 is a deficient number, since it is larger than the sum of its proper divisors (280684590091).

2511229031861 is a wasteful number, since it uses less digits than its factorization.

2511229031861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349913 (or 349902 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 2511229031861 in words is "two trillion, five hundred eleven billion, two hundred twenty-nine million, thirty-one thousand, eight hundred sixty-one".