51320061 has 60 divisors (see below), whose sum is σ = 87154848. Its totient is φ = 30023136.

The previous prime is 51320047. The next prime is 51320077. The reversal of 51320061 is 16002315.

It is not a de Polignac number, because 51320061 - 2²¹ = 49222909 is a prime.

It is a super-2 number, since 2×51320061² = 5267497322087442, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51320041) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 314766 + ... + 314928.

Almost surely, 2^51320061 is an apocalyptic number.

It is an amenable number.

51320061 is a deficient number, since it is larger than the sum of its proper divisors (35834787).

51320061 is a wasteful number, since it uses less digits than its factorization.

51320061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 51320061 is about 7163.8021329459. The cubic root of 51320061 is about 371.6171268828.

Adding to 51320061 its reverse (16002315), we get a palindrome (67322376).

The spelling of 51320061 in words is "fifty-one million, three hundred twenty thousand, sixty-one".