51361613 has 8 divisors (see below), whose sum is σ = 52750080. Its totient is φ = 49991760.

The previous prime is 51361591. The next prime is 51361621. The reversal of 51361613 is 31616315.

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 51361613 - 2⁶ = 51361549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51351613) 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, 1031 + ... + 10187.

It is an arithmetic number, because the mean of its divisors is an integer number (6593760).

Almost surely, 2^51361613 is an apocalyptic number.

It is an amenable number.

51361613 is a deficient number, since it is larger than the sum of its proper divisors (1388467).

51361613 is an equidigital number, since it uses as much as digits as its factorization.

51361613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9307.

The product of its digits is 1620, while the sum is 26.

The square root of 51361613 is about 7166.7016820850. The cubic root of 51361613 is about 371.7173948155.

Adding to 51361613 its reverse (31616315), we get a palindrome (82977928).

It can be divided in two parts, 513 and 61613, that added together give a palindrome (62126).

The spelling of 51361613 in words is "fifty-one million, three hundred sixty-one thousand, six hundred thirteen".