51120861 has 16 divisors (see below), whose sum is σ = 75021120. Its totient is φ = 30705920.

The previous prime is 51120841. The next prime is 51120863. The reversal of 51120861 is 16802115.

It is a cyclic number.

It is not a de Polignac number, because 51120861 - 2¹³ = 51112669 is a prime.

It is a super-2 number, since 2×51120861² = 5226684858762642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51120863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3126 + ... + 10583.

It is an arithmetic number, because the mean of its divisors is an integer number (4688820).

Almost surely, 2^51120861 is an apocalyptic number.

It is an amenable number.

51120861 is a deficient number, since it is larger than the sum of its proper divisors (23900259).

51120861 is a wasteful number, since it uses less digits than its factorization.

51120861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13836.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 51120861 is about 7149.8853836967. The cubic root of 51120861 is about 371.1356899596.

Adding to 51120861 its reverse (16802115), we get a palindrome (67922976).

The spelling of 51120861 in words is "fifty-one million, one hundred twenty thousand, eight hundred sixty-one".