61506613 has 6 divisors (see below), whose sum is σ = 71548566. Its totient is φ = 52719912.

The previous prime is 61506611. The next prime is 61506619. The reversal of 61506613 is 31660516.

It can be written as a sum of positive squares in only one way, i.e., 56520324 + 4986289 = 7518^2 + 2233^2 .

It is not a de Polignac number, because 61506613 - 2¹ = 61506611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61506611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 627570 + ... + 627667.

It is an arithmetic number, because the mean of its divisors is an integer number (11924761).

Almost surely, 2^61506613 is an apocalyptic number.

It is an amenable number.

61506613 is a deficient number, since it is larger than the sum of its proper divisors (10041953).

61506613 is a wasteful number, since it uses less digits than its factorization.

61506613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255251 (or 1255244 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 61506613 is about 7842.6151888257. The cubic root of 61506613 is about 394.7364861024.

The spelling of 61506613 in words is "sixty-one million, five hundred six thousand, six hundred thirteen".