8428001261 has 4 divisors (see below), whose sum is σ = 8570848800. Its totient is φ = 8285153724.

The previous prime is 8428001213. The next prime is 8428001273. The reversal of 8428001261 is 1621008248.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8428001261 - 2¹⁰ = 8428000237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8428001291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71423681 + ... + 71423798.

It is an arithmetic number, because the mean of its divisors is an integer number (2142712200).

Almost surely, 2^8428001261 is an apocalyptic number.

It is an amenable number.

8428001261 is a deficient number, since it is larger than the sum of its proper divisors (142847539).

8428001261 is a wasteful number, since it uses less digits than its factorization.

8428001261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142847538.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 8428001261 is about 91804.1462081098. The cubic root of 8428001261 is about 2035.0489687118.

The spelling of 8428001261 in words is "eight billion, four hundred twenty-eight million, one thousand, two hundred sixty-one".