61321513 has 8 divisors (see below), whose sum is σ = 66957120. Its totient is φ = 55696080.

The previous prime is 61321489. The next prime is 61321517. The reversal of 61321513 is 31512316.

It is a happy number.

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

It is not a de Polignac number, because 61321513 - 2²⁵ = 27767081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61321517) 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, 15943 + ... + 19411.

It is an arithmetic number, because the mean of its divisors is an integer number (8369640).

Almost surely, 2^61321513 is an apocalyptic number.

It is an amenable number.

61321513 is a deficient number, since it is larger than the sum of its proper divisors (5635607).

61321513 is a wasteful number, since it uses less digits than its factorization.

61321513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5087.

The product of its digits is 540, while the sum is 22.

The square root of 61321513 is about 7830.8053864210. The cubic root of 61321513 is about 394.3401106112.

Adding to 61321513 its reverse (31512316), we get a palindrome (92833829).

The spelling of 61321513 in words is "sixty-one million, three hundred twenty-one thousand, five hundred thirteen".