51151669 has 4 divisors (see below), whose sum is σ = 51207660. Its totient is φ = 51095680.

The previous prime is 51151613. The next prime is 51151687. The reversal of 51151669 is 96615115.

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 9394225 + 41757444 = 3065^2 + 6462^2 .

It is a cyclic number.

It is not a de Polignac number, because 51151669 - 2¹¹ = 51149621 is a prime.

It is a super-2 number, since 2×51151669² = 5232986482971122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51151069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26602 + ... + 28459.

It is an arithmetic number, because the mean of its divisors is an integer number (12801915).

Almost surely, 2^51151669 is an apocalyptic number.

It is an amenable number.

51151669 is a deficient number, since it is larger than the sum of its proper divisors (55991).

51151669 is an equidigital number, since it uses as much as digits as its factorization.

51151669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55990.

The product of its digits is 8100, while the sum is 34.

The square root of 51151669 is about 7152.0394993316. The cubic root of 51151669 is about 371.2102299941.

The spelling of 51151669 in words is "fifty-one million, one hundred fifty-one thousand, six hundred sixty-nine".