521265001 has 4 divisors (see below), whose sum is σ = 521316432. Its totient is φ = 521213572.

The previous prime is 521264993. The next prime is 521265007. The reversal of 521265001 is 100562125.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 521265001 - 2³ = 521264993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521265007) 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, 4891 + ... + 32656.

It is an arithmetic number, because the mean of its divisors is an integer number (130329108).

Almost surely, 2^521265001 is an apocalyptic number.

It is an amenable number.

521265001 is a deficient number, since it is larger than the sum of its proper divisors (51431).

521265001 is a wasteful number, since it uses less digits than its factorization.

521265001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51430.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 521265001 is about 22831.2286353582. The cubic root of 521265001 is about 804.7967034182.

The spelling of 521265001 in words is "five hundred twenty-one million, two hundred sixty-five thousand, one".