61561513 has 8 divisors (see below), whose sum is σ = 66358656. Its totient is φ = 56773200.

The previous prime is 61561483. The next prime is 61561529. The reversal of 61561513 is 31516516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61561513 - 2⁵ = 61561481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61561583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23058 + ... + 25588.

It is an arithmetic number, because the mean of its divisors is an integer number (8294832).

Almost surely, 2^61561513 is an apocalyptic number.

It is an amenable number.

61561513 is a deficient number, since it is larger than the sum of its proper divisors (4797143).

61561513 is a wasteful number, since it uses less digits than its factorization.

61561513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415.

The product of its digits is 2700, while the sum is 28.

The square root of 61561513 is about 7846.1145161156. The cubic root of 61561513 is about 394.8538967215.

It can be divided in two parts, 615 and 61513, that added together give a triangular number (62128 = T₃₅₂).

The spelling of 61561513 in words is "sixty-one million, five hundred sixty-one thousand, five hundred thirteen".