4251121361 has 8 divisors (see below), whose sum is σ = 4333452264. Its totient is φ = 4168869120.

The previous prime is 4251121319. The next prime is 4251121393. The reversal of 4251121361 is 1631211524.

It can be written as a sum of positive squares in 4 ways, for example, as 1412256400 + 2838864961 = 37580^2 + 53281^2 .

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 4251121361 - 2³⁰ = 3177379537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4251121361.

It is not an unprimeable number, because it can be changed into a prime (4251121661) 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, 95975 + ... + 133091.

It is an arithmetic number, because the mean of its divisors is an integer number (541681533).

Almost surely, 2^4251121361 is an apocalyptic number.

It is an amenable number.

4251121361 is a deficient number, since it is larger than the sum of its proper divisors (82330903).

4251121361 is a wasteful number, since it uses less digits than its factorization.

4251121361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39331.

The product of its digits is 1440, while the sum is 26.

The square root of 4251121361 is about 65200.6239310637. The cubic root of 4251121361 is about 1619.9483498495.

Adding to 4251121361 its reverse (1631211524), we get a palindrome (5882332885).

The spelling of 4251121361 in words is "four billion, two hundred fifty-one million, one hundred twenty-one thousand, three hundred sixty-one".