535121661 has 4 divisors (see below), whose sum is σ = 713495552. Its totient is φ = 356747772.

The previous prime is 535121633. The next prime is 535121663. The reversal of 535121661 is 166121535.

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 not a de Polignac number, because 535121661 - 2¹⁰ = 535120637 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 (535121663) 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, 89186941 + ... + 89186946.

It is an arithmetic number, because the mean of its divisors is an integer number (178373888).

Almost surely, 2^535121661 is an apocalyptic number.

It is an amenable number.

535121661 is a deficient number, since it is larger than the sum of its proper divisors (178373891).

535121661 is a wasteful number, since it uses less digits than its factorization.

535121661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178373890.

The product of its digits is 5400, while the sum is 30.

The square root of 535121661 is about 23132.6967947968. The cubic root of 535121661 is about 811.8656690313.

The spelling of 535121661 in words is "five hundred thirty-five million, one hundred twenty-one thousand, six hundred sixty-one".