61531133 has 2 divisors, whose sum is σ = 61531134. Its totient is φ = 61531132.

The previous prime is 61531123. The next prime is 61531147. The reversal of 61531133 is 33113516.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45185284 + 16345849 = 6722^2 + 4043^2 .

It is a cyclic number.

It is not a de Polignac number, because 61531133 - 2⁴ = 61531117 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61531099 and 61531108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61531103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30765566 + 30765567.

It is an arithmetic number, because the mean of its divisors is an integer number (30765567).

Almost surely, 2^61531133 is an apocalyptic number.

It is an amenable number.

61531133 is a deficient number, since it is larger than the sum of its proper divisors (1).

61531133 is an equidigital number, since it uses as much as digits as its factorization.

61531133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 23.

The square root of 61531133 is about 7844.1782871120. The cubic root of 61531133 is about 394.7889338652.

Adding to 61531133 its reverse (33113516), we get a palindrome (94644649).

The spelling of 61531133 in words is "sixty-one million, five hundred thirty-one thousand, one hundred thirty-three".