51451117 has 4 divisors (see below), whose sum is σ = 51960636. Its totient is φ = 50941600.

The previous prime is 51451111. The next prime is 51451123. The reversal of 51451117 is 71115415.

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

It is an interprime number because it is at equal distance from previous prime (51451111) and next prime (51451123).

It can be written as a sum of positive squares in 2 ways, for example, as 42653961 + 8797156 = 6531^2 + 2966^2 .

It is a cyclic number.

It is not a de Polignac number, because 51451117 - 2¹⁵ = 51418349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51451091 and 51451100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51451111) 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, 254608 + ... + 254809.

It is an arithmetic number, because the mean of its divisors is an integer number (12990159).

Almost surely, 2^51451117 is an apocalyptic number.

It is an amenable number.

51451117 is a deficient number, since it is larger than the sum of its proper divisors (509519).

51451117 is a wasteful number, since it uses less digits than its factorization.

51451117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509518.

The product of its digits is 700, while the sum is 25.

The square root of 51451117 is about 7172.9433986335. The cubic root of 51451117 is about 371.9331907809.

The spelling of 51451117 in words is "fifty-one million, four hundred fifty-one thousand, one hundred seventeen".