61561033 has 4 divisors (see below), whose sum is σ = 62252820. Its totient is φ = 60869248.

The previous prime is 61561001. The next prime is 61561051. The reversal of 61561033 is 33016516.

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 26656569 + 34904464 = 5163^2 + 5908^2 .

It is a cyclic number.

It is not a de Polignac number, because 61561033 - 2⁵ = 61561001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61560989 and 61561007.

It is not an unprimeable number, because it can be changed into a prime (61561733) 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, 345760 + ... + 345937.

It is an arithmetic number, because the mean of its divisors is an integer number (15563205).

Almost surely, 2^61561033 is an apocalyptic number.

It is an amenable number.

61561033 is a deficient number, since it is larger than the sum of its proper divisors (691787).

61561033 is an equidigital number, since it uses as much as digits as its factorization.

61561033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691786.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 61561033 is about 7846.0839276674. The cubic root of 61561033 is about 394.8528704831.

Adding to 61561033 its reverse (33016516), we get a palindrome (94577549).

The spelling of 61561033 in words is "sixty-one million, five hundred sixty-one thousand, thirty-three".