51091641 has 20 divisors (see below), whose sum is σ = 76520400. Its totient is φ = 33972696.

The previous prime is 51091639. The next prime is 51091643. The reversal of 51091641 is 14619015.

51091641 is a `hidden beast` number, since 5 + 10 + 9 + 1 + 641 = 666.

51091641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51091639) and next prime (51091643).

It is not a de Polignac number, because 51091641 - 2¹ = 51091639 is a prime.

It is a super-2 number, since 2×51091641² = 5220711560145762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51091643) 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 19 ways as a sum of consecutive naturals, for example, 49630 + ... + 50648.

It is an arithmetic number, because the mean of its divisors is an integer number (3826020).

Almost surely, 2^51091641 is an apocalyptic number.

It is an amenable number.

51091641 is a deficient number, since it is larger than the sum of its proper divisors (25428759).

51091641 is a wasteful number, since it uses less digits than its factorization.

51091641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650 (or 1641 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 51091641 is about 7147.8417022203. The cubic root of 51091641 is about 371.0649644182.

The spelling of 51091641 in words is "fifty-one million, ninety-one thousand, six hundred forty-one".