51149641 has 4 divisors (see below), whose sum is σ = 51172992. Its totient is φ = 51126292.

The previous prime is 51149639. The next prime is 51149687. The reversal of 51149641 is 14694115.

51149641 = T₅₈₃₈ + T₅₈₃₉ + T₅₈₄₀.

51149641 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51149641 - 2¹ = 51149639 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51149621) 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, 8005 + ... + 12898.

It is an arithmetic number, because the mean of its divisors is an integer number (12793248).

Almost surely, 2^51149641 is an apocalyptic number.

51149641 is the 5840-th centered triangular number.

It is an amenable number.

51149641 is a deficient number, since it is larger than the sum of its proper divisors (23351).

51149641 is a wasteful number, since it uses less digits than its factorization.

51149641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23350.

The product of its digits is 4320, while the sum is 31.

The square root of 51149641 is about 7151.8977201859. The cubic root of 51149641 is about 371.2053241633.

The spelling of 51149641 in words is "fifty-one million, one hundred forty-nine thousand, six hundred forty-one".