2641523781 has 16 divisors (see below), whose sum is σ = 3793879040. Its totient is φ = 1625158080.

The previous prime is 2641523777. The next prime is 2641523791. The reversal of 2641523781 is 1873251462.

2641523781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2641523781 - 2² = 2641523777 is a prime.

It is a super-2 number, since 2×2641523781² = 13955295771177071922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2641523701) 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, 315315 + ... + 323583.

It is an arithmetic number, because the mean of its divisors is an integer number (237117440).

Almost surely, 2^2641523781 is an apocalyptic number.

It is an amenable number.

2641523781 is a deficient number, since it is larger than the sum of its proper divisors (1152355259).

2641523781 is a wasteful number, since it uses less digits than its factorization.

2641523781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16476.

The product of its digits is 80640, while the sum is 39.

The square root of 2641523781 is about 51395.7564493412. The cubic root of 2641523781 is about 1382.3505032330.

The spelling of 2641523781 in words is "two billion, six hundred forty-one million, five hundred twenty-three thousand, seven hundred eighty-one".