61510013 has 4 divisors (see below), whose sum is σ = 61643328. Its totient is φ = 61376700.

The previous prime is 61509991. The next prime is 61510039. The reversal of 61510013 is 31001516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61510013 - 2¹⁸ = 61247869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61509973 and 61510000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61510093) 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, 65963 + ... + 66888.

It is an arithmetic number, because the mean of its divisors is an integer number (15410832).

Almost surely, 2^61510013 is an apocalyptic number.

It is an amenable number.

61510013 is a deficient number, since it is larger than the sum of its proper divisors (133315).

61510013 is a wasteful number, since it uses less digits than its factorization.

61510013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133314.

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

The square root of 61510013 is about 7842.8319502588. The cubic root of 61510013 is about 394.7437594630.

Adding to 61510013 its reverse (31001516), we get a palindrome (92511529).

The spelling of 61510013 in words is "sixty-one million, five hundred ten thousand, thirteen".