51780351 has 16 divisors (see below), whose sum is σ = 83545344. Its totient is φ = 27848064.

The previous prime is 51780349. The next prime is 51780359. The reversal of 51780351 is 15308715.

It is not a de Polignac number, because 51780351 - 2¹ = 51780349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51780359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72165 + ... + 72878.

It is an arithmetic number, because the mean of its divisors is an integer number (5221584).

Almost surely, 2^51780351 is an apocalyptic number.

51780351 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

51780351 is a deficient number, since it is larger than the sum of its proper divisors (31764993).

51780351 is a wasteful number, since it uses less digits than its factorization.

51780351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145070.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 51780351 is about 7195.8565160792. The cubic root of 51780351 is about 372.7248340132.

The spelling of 51780351 in words is "fifty-one million, seven hundred eighty thousand, three hundred fifty-one".