61100513 has 4 divisors (see below), whose sum is σ = 61129668. Its totient is φ = 61071360.

The previous prime is 61100509. The next prime is 61100539. The reversal of 61100513 is 31500116.

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 51165409 + 9935104 = 7153^2 + 3152^2 .

It is a cyclic number.

It is not a de Polignac number, because 61100513 - 2² = 61100509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61100491 and 61100500.

It is not an unprimeable number, because it can be changed into a prime (61100563) 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, 11168 + ... + 15713.

It is an arithmetic number, because the mean of its divisors is an integer number (15282417).

Almost surely, 2^61100513 is an apocalyptic number.

It is an amenable number.

61100513 is a deficient number, since it is larger than the sum of its proper divisors (29155).

61100513 is a wasteful number, since it uses less digits than its factorization.

61100513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29154.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 61100513 is about 7816.6817128498. The cubic root of 61100513 is about 393.8658123093.

Adding to 61100513 its reverse (31500116), we get a palindrome (92600629).

The spelling of 61100513 in words is "sixty-one million, one hundred thousand, five hundred thirteen".