51481169 has 4 divisors (see below), whose sum is σ = 51536820. Its totient is φ = 51425520.

The previous prime is 51481163. The next prime is 51481181. The reversal of 51481169 is 96118415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25603600 + 25877569 = 5060^2 + 5087^2 .

It is a cyclic number.

It is not a de Polignac number, because 51481169 - 2¹² = 51477073 is a prime.

It is a super-2 number, since 2×51481169² = 5300621523213122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51481163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26414 + ... + 28295.

It is an arithmetic number, because the mean of its divisors is an integer number (12884205).

Almost surely, 2^51481169 is an apocalyptic number.

It is an amenable number.

51481169 is a deficient number, since it is larger than the sum of its proper divisors (55651).

51481169 is an equidigital number, since it uses as much as digits as its factorization.

51481169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55650.

The product of its digits is 8640, while the sum is 35.

The square root of 51481169 is about 7175.0379093075. The cubic root of 51481169 is about 372.0055906394.

The spelling of 51481169 in words is "fifty-one million, four hundred eighty-one thousand, one hundred sixty-nine".