535620721 has 4 divisors (see below), whose sum is σ = 535878000. Its totient is φ = 535363444.

The previous prime is 535620671. The next prime is 535620731. The reversal of 535620721 is 127026535.

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 an emirpimes, since its reverse is a distinct semiprime: 127026535 = 5 ⋅25405307.

It is a cyclic number.

It is not a de Polignac number, because 535620721 - 2⁹ = 535620209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (535620731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125491 + ... + 129688.

It is an arithmetic number, because the mean of its divisors is an integer number (133969500).

Almost surely, 2^535620721 is an apocalyptic number.

It is an amenable number.

535620721 is a deficient number, since it is larger than the sum of its proper divisors (257279).

535620721 is a wasteful number, since it uses less digits than its factorization.

535620721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257278.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 535620721 is about 23143.4811772127. The cubic root of 535620721 is about 812.1179753885.

The spelling of 535620721 in words is "five hundred thirty-five million, six hundred twenty thousand, seven hundred twenty-one".