2581981390 has 16 divisors (see below), whose sum is σ = 4735257408. Its totient is φ = 1013305696.

The previous prime is 2581981333. The next prime is 2581981393. The reversal of 2581981390 is 931891852.

It is a self number, because there is not a number n which added to its sum of digits gives 2581981390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581981393) 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, 2435302 + ... + 2436361.

It is an arithmetic number, because the mean of its divisors is an integer number (295953588).

Almost surely, 2^2581981390 is an apocalyptic number.

2581981390 is a deficient number, since it is larger than the sum of its proper divisors (2153276018).

2581981390 is a wasteful number, since it uses less digits than its factorization.

2581981390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4871723.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 2581981390 is about 50813.2009422748. The cubic root of 2581981390 is about 1371.8849840685.

The spelling of 2581981390 in words is "two billion, five hundred eighty-one million, nine hundred eighty-one thousand, three hundred ninety".