51113661 has 8 divisors (see below), whose sum is σ = 68191200. Its totient is φ = 34055952.

The previous prime is 51113639. The next prime is 51113663. The reversal of 51113661 is 16631115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51113661 - 2⁶ = 51113597 is a prime.

It is a super-2 number, since 2×51113661² = 5225212681645842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51113663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2790 + ... + 10488.

It is an arithmetic number, because the mean of its divisors is an integer number (8523900).

Almost surely, 2^51113661 is an apocalyptic number.

It is an amenable number.

51113661 is a deficient number, since it is larger than the sum of its proper divisors (17077539).

51113661 is a wasteful number, since it uses less digits than its factorization.

51113661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9915.

The product of its digits is 540, while the sum is 24.

The square root of 51113661 is about 7149.3818613919. The cubic root of 51113661 is about 371.1182652242.

Adding to 51113661 its reverse (16631115), we get a palindrome (67744776).

The spelling of 51113661 in words is "fifty-one million, one hundred thirteen thousand, six hundred sixty-one".