51102661 has 4 divisors (see below), whose sum is σ = 52483852. Its totient is φ = 49721472.

The previous prime is 51102659. The next prime is 51102671. The reversal of 51102661 is 16620115.

51102661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 48233025 + 2869636 = 6945^2 + 1694^2 .

It is a cyclic number.

It is not a de Polignac number, because 51102661 - 2¹ = 51102659 is a prime.

It is a super-2 number, since 2×51102661² = 5222963922561842, 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 (51102671) 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 3 ways as a sum of consecutive naturals, for example, 690540 + ... + 690613.

It is an arithmetic number, because the mean of its divisors is an integer number (13120963).

Almost surely, 2^51102661 is an apocalyptic number.

It is an amenable number.

51102661 is a deficient number, since it is larger than the sum of its proper divisors (1381191).

51102661 is a wasteful number, since it uses less digits than its factorization.

51102661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381190.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 51102661 is about 7148.6125227208. The cubic root of 51102661 is about 371.0916409408.

Adding to 51102661 its reverse (16620115), we get a palindrome (67722776).

The spelling of 51102661 in words is "fifty-one million, one hundred two thousand, six hundred sixty-one".