61535 has 8 divisors (see below), whose sum is σ = 76416. Its totient is φ = 47520.

The previous prime is 61519. The next prime is 61543. The reversal of 61535 is 53516.

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

It is not a de Polignac number, because 61535 - 2⁴ = 61519 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44 + ... + 353.

It is an arithmetic number, because the mean of its divisors is an integer number (9552).

2⁶¹⁵³⁵ is an apocalyptic number.

61535 is a deficient number, since it is larger than the sum of its proper divisors (14881).

61535 is a wasteful number, since it uses less digits than its factorization.

61535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433.

The product of its digits is 450, while the sum is 20.

The square root of 61535 is about 248.0624921265. The cubic root of 61535 is about 39.4797204025.

The spelling of 61535 in words is "sixty-one thousand, five hundred thirty-five".