521540007 has 8 divisors (see below), whose sum is σ = 696063984. Its totient is φ = 347354688.

The previous prime is 521540003. The next prime is 521540023. The reversal of 521540007 is 700045125.

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

It is not a de Polignac number, because 521540007 - 2² = 521540003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521540003) 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, 81048 + ... + 87245.

It is an arithmetic number, because the mean of its divisors is an integer number (87007998).

Almost surely, 2^521540007 is an apocalyptic number.

521540007 is a deficient number, since it is larger than the sum of its proper divisors (174523977).

521540007 is a wasteful number, since it uses less digits than its factorization.

521540007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169329.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 521540007 is about 22837.2504255657. The cubic root of 521540007 is about 804.9382085461.

The spelling of 521540007 in words is "five hundred twenty-one million, five hundred forty thousand, seven".