535642991 has 4 divisors (see below), whose sum is σ = 576846312. Its totient is φ = 494439672.

The previous prime is 535642979. The next prime is 535643027. The reversal of 535642991 is 199246535.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199246535 = 5 ⋅39849307.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-535642991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (535612991) 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, 20601641 + ... + 20601666.

It is an arithmetic number, because the mean of its divisors is an integer number (144211578).

Almost surely, 2^535642991 is an apocalyptic number.

535642991 is a deficient number, since it is larger than the sum of its proper divisors (41203321).

535642991 is a wasteful number, since it uses less digits than its factorization.

535642991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41203320.

The product of its digits is 291600, while the sum is 44.

The square root of 535642991 is about 23143.9623012137. The cubic root of 535642991 is about 812.1292306269.

The spelling of 535642991 in words is "five hundred thirty-five million, six hundred forty-two thousand, nine hundred ninety-one".