4000520251 has 8 divisors (see below), whose sum is σ = 4923717344. Its totient is φ = 3165246720.

The previous prime is 4000520233. The next prime is 4000520267. The reversal of 4000520251 is 1520250004.

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

It is a cyclic number.

It is not a de Polignac number, because 4000520251 - 2⁷ = 4000520123 is a prime.

It is a super-2 number, since 2×4000520251² = 32008324557322206002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4000520551) 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, 21980790 + ... + 21980971.

It is an arithmetic number, because the mean of its divisors is an integer number (615464668).

Almost surely, 2^4000520251 is an apocalyptic number.

4000520251 is a deficient number, since it is larger than the sum of its proper divisors (923197093).

4000520251 is a wasteful number, since it uses less digits than its factorization.

4000520251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43961781.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 4000520251 is about 63249.6660149285. Note that the first 3 decimals coincide. The cubic root of 4000520251 is about 1587.4698695668.

Adding to 4000520251 its reverse (1520250004), we get a palindrome (5520770255).

The spelling of 4000520251 in words is "four billion, five hundred twenty thousand, two hundred fifty-one".