61303513 has 4 divisors (see below), whose sum is σ = 64909620. Its totient is φ = 57697408.

The previous prime is 61303507. The next prime is 61303531. The reversal of 61303513 is 31530316.

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 18636489 + 42667024 = 4317^2 + 6532^2 .

It is a cyclic number.

It is not a de Polignac number, because 61303513 - 2⁹ = 61303001 is a prime.

It is a super-2 number, since 2×61303513² = 7516241412282338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61303553) 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, 1803028 + ... + 1803061.

It is an arithmetic number, because the mean of its divisors is an integer number (16227405).

Almost surely, 2^61303513 is an apocalyptic number.

It is an amenable number.

61303513 is a deficient number, since it is larger than the sum of its proper divisors (3606107).

61303513 is a wasteful number, since it uses less digits than its factorization.

61303513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3606106.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 61303513 is about 7829.6559949975. The cubic root of 61303513 is about 394.3015226493.

Adding to 61303513 its reverse (31530316), we get a palindrome (92833829).

It can be divided in two parts, 61303 and 513, that added together give a palindrome (61816).

The spelling of 61303513 in words is "sixty-one million, three hundred three thousand, five hundred thirteen".