2781241551 has 24 divisors (see below), whose sum is σ = 4385856384. Its totient is φ = 1684334160.

The previous prime is 2781241499. The next prime is 2781241553. The reversal of 2781241551 is 1551421872.

It is a happy number.

2781241551 is a `hidden beast` number, since 2 + 7 + 81 + 24 + 1 + 551 = 666.

2781241551 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2781241551 - 2¹⁸ = 2780979407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781241553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131430 + ... + 151116.

It is an arithmetic number, because the mean of its divisors is an integer number (182744016).

Almost surely, 2^2781241551 is an apocalyptic number.

2781241551 is a deficient number, since it is larger than the sum of its proper divisors (1604614833).

2781241551 is a wasteful number, since it uses less digits than its factorization.

2781241551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21131 (or 21128 counting only the distinct ones).

The product of its digits is 22400, while the sum is 36.

The square root of 2781241551 is about 52737.4776700593. The cubic root of 2781241551 is about 1406.3051580380.

The spelling of 2781241551 in words is "two billion, seven hundred eighty-one million, two hundred forty-one thousand, five hundred fifty-one".