61731533 has 4 divisors (see below), whose sum is σ = 61753980. Its totient is φ = 61709088.

The previous prime is 61731521. The next prime is 61731541. The reversal of 61731533 is 33513716.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19909444 + 41822089 = 4462^2 + 6467^2 .

It is a cyclic number.

It is not a de Polignac number, because 61731533 - 2⁸ = 61731277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61731496 and 61731505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61731833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6410 + ... + 12827.

It is an arithmetic number, because the mean of its divisors is an integer number (15438495).

Almost surely, 2^61731533 is an apocalyptic number.

It is an amenable number.

61731533 is a deficient number, since it is larger than the sum of its proper divisors (22447).

61731533 is a wasteful number, since it uses less digits than its factorization.

61731533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22446.

The product of its digits is 5670, while the sum is 29.

The square root of 61731533 is about 7856.9417078148. The cubic root of 61731533 is about 395.2170638391.

The spelling of 61731533 in words is "sixty-one million, seven hundred thirty-one thousand, five hundred thirty-three".