2541887781 has 8 divisors (see below), whose sum is σ = 3389745984. Its totient is φ = 1694310720.

The previous prime is 2541887759. The next prime is 2541887801. The reversal of 2541887781 is 1877881452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2541887781 - 2⁶ = 2541887717 is a prime.

It is a super-2 number, since 2×2541887781² = 12922386982394207922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2541687781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48196 + ... + 86061.

It is an arithmetic number, because the mean of its divisors is an integer number (423718248).

Almost surely, 2^2541887781 is an apocalyptic number.

It is an amenable number.

2541887781 is a deficient number, since it is larger than the sum of its proper divisors (847858203).

2541887781 is a wasteful number, since it uses less digits than its factorization.

2541887781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140571.

The product of its digits is 1003520, while the sum is 51.

The square root of 2541887781 is about 50417.1377708017. The cubic root of 2541887781 is about 1364.7469251333.

The spelling of 2541887781 in words is "two billion, five hundred forty-one million, eight hundred eighty-seven thousand, seven hundred eighty-one".