51781045 has 8 divisors (see below), whose sum is σ = 62718624. Its totient is φ = 41037264.

The previous prime is 51781043. The next prime is 51781057. The reversal of 51781045 is 54018715.

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

It is a cyclic number.

It is not a de Polignac number, because 51781045 - 2¹ = 51781043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51780998 and 51781016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51781043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47859 + ... + 48928.

It is an arithmetic number, because the mean of its divisors is an integer number (7839828).

Almost surely, 2^51781045 is an apocalyptic number.

It is an amenable number.

51781045 is a deficient number, since it is larger than the sum of its proper divisors (10937579).

51781045 is a wasteful number, since it uses less digits than its factorization.

51781045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96899.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 51781045 is about 7195.9047381132. The cubic root of 51781045 is about 372.7264991872.

Subtracting 51781045 from its reverse (54018715), we obtain a triangular number (2237670 = T₂₁₁₅).

The spelling of 51781045 in words is "fifty-one million, seven hundred eighty-one thousand, forty-five".