51156397 has 8 divisors (see below), whose sum is σ = 52516800. Its totient is φ = 49801440.

The previous prime is 51156361. The next prime is 51156403. The reversal of 51156397 is 79365115.

51156397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51156397 - 2¹¹ = 51154349 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 (51156337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23518 + ... + 25600.

It is an arithmetic number, because the mean of its divisors is an integer number (6564600).

Almost surely, 2^51156397 is an apocalyptic number.

It is an amenable number.

51156397 is a deficient number, since it is larger than the sum of its proper divisors (1360403).

51156397 is a wasteful number, since it uses less digits than its factorization.

51156397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2723.

The product of its digits is 28350, while the sum is 37.

The square root of 51156397 is about 7152.3700267813. The cubic root of 51156397 is about 371.2216667528.

The spelling of 51156397 in words is "fifty-one million, one hundred fifty-six thousand, three hundred ninety-seven".