61261817 has 4 divisors (see below), whose sum is σ = 61277556. Its totient is φ = 61246080.

The previous prime is 61261813. The next prime is 61261841. The reversal of 61261817 is 71816216.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 58125376 + 3136441 = 7624^2 + 1771^2 .

It is a cyclic number.

It is not a de Polignac number, because 61261817 - 2² = 61261813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61261813) 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, 2717 + ... + 11397.

It is an arithmetic number, because the mean of its divisors is an integer number (15319389).

Almost surely, 2^61261817 is an apocalyptic number.

It is an amenable number.

61261817 is a deficient number, since it is larger than the sum of its proper divisors (15739).

61261817 is an equidigital number, since it uses as much as digits as its factorization.

61261817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15738.

The product of its digits is 4032, while the sum is 32.

The square root of 61261817 is about 7826.9928452759. The cubic root of 61261817 is about 394.2121067560.

The spelling of 61261817 in words is "sixty-one million, two hundred sixty-one thousand, eight hundred seventeen".