2581391401 has 8 divisors (see below), whose sum is σ = 2753191080. Its totient is φ = 2411808768.

The previous prime is 2581391381. The next prime is 2581391429. The reversal of 2581391401 is 1041931852.

2581391401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 601230400 + 1980161001 = 24520^2 + 44499^2 .

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

It is not a de Polignac number, because 2581391401 - 2⁵ = 2581391369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2581398401) 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, 551856 + ... + 556513.

It is an arithmetic number, because the mean of its divisors is an integer number (344148885).

Almost surely, 2^2581391401 is an apocalyptic number.

It is an amenable number.

2581391401 is a deficient number, since it is larger than the sum of its proper divisors (171799679).

2581391401 is a wasteful number, since it uses less digits than its factorization.

2581391401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108523.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 2581391401 is about 50807.3951408651. The cubic root of 2581391401 is about 1371.7804830949.

The spelling of 2581391401 in words is "two billion, five hundred eighty-one million, three hundred ninety-one thousand, four hundred one".