51440061 has 8 divisors (see below), whose sum is σ = 68830240. Its totient is φ = 34171632.

The previous prime is 51440047. The next prime is 51440071. The reversal of 51440061 is 16004415.

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

It is not a de Polignac number, because 51440061 - 2¹³ = 51431869 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 (51440021) 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, 29446 + ... + 31143.

It is an arithmetic number, because the mean of its divisors is an integer number (8603780).

Almost surely, 2^51440061 is an apocalyptic number.

It is an amenable number.

51440061 is a deficient number, since it is larger than the sum of its proper divisors (17390179).

51440061 is a wasteful number, since it uses less digits than its factorization.

51440061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60875.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 51440061 is about 7172.1726833645. The cubic root of 51440061 is about 371.9065480944.

Adding to 51440061 its reverse (16004415), we get a palindrome (67444476).

The spelling of 51440061 in words is "fifty-one million, four hundred forty thousand, sixty-one".