61533121 has 4 divisors (see below), whose sum is σ = 66266452. Its totient is φ = 56799792.

The previous prime is 61533107. The next prime is 61533137. The reversal of 61533121 is 12133516.

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 18447025 + 43086096 = 4295^2 + 6564^2 .

It is a cyclic number.

It is not a de Polignac number, because 61533121 - 2⁹ = 61532609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61533092 and 61533101.

It is not an unprimeable number, because it can be changed into a prime (61533161) 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, 2366646 + ... + 2366671.

It is an arithmetic number, because the mean of its divisors is an integer number (16566613).

Almost surely, 2^61533121 is an apocalyptic number.

It is an amenable number.

61533121 is a deficient number, since it is larger than the sum of its proper divisors (4733331).

61533121 is a wasteful number, since it uses less digits than its factorization.

61533121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733330.

The product of its digits is 540, while the sum is 22.

The square root of 61533121 is about 7844.3050042690. The cubic root of 61533121 is about 394.7931855446.

Adding to 61533121 its reverse (12133516), we get a palindrome (73666637).

The spelling of 61533121 in words is "sixty-one million, five hundred thirty-three thousand, one hundred twenty-one".