2551401240 has 32 divisors (see below), whose sum is σ = 7654204080. Its totient is φ = 680373632.

The previous prime is 2551401233. The next prime is 2551401253. The reversal of 2551401240 is 421041552.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2551401240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10630719 + ... + 10630958.

Almost surely, 2^2551401240 is an apocalyptic number.

2551401240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2551401240 is an abundant number, since it is smaller than the sum of its proper divisors (5102802840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2551401240 is a wasteful number, since it uses less digits than its factorization.

2551401240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21261691 (or 21261687 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 2551401240 is about 50511.3971297568. The cubic root of 2551401240 is about 1366.4474066917.

Adding to 2551401240 its reverse (421041552), we get a palindrome (2972442792).

The spelling of 2551401240 in words is "two billion, five hundred fifty-one million, four hundred one thousand, two hundred forty".