51641550 has 120 divisors (see below), whose sum is σ = 147459312. Its totient is φ = 13392000.

The previous prime is 51641549. The next prime is 51641621. The reversal of 51641550 is 5514615.

It is a happy number.

51641550 is a `hidden beast` number, since 51 + 64 + 1 + 550 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 165895 + ... + 166205.

Almost surely, 2^51641550 is an apocalyptic number.

51641550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51641550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73729656).

51641550 is an abundant number, since it is smaller than the sum of its proper divisors (95817762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51641550 is a wasteful number, since it uses less digits than its factorization.

51641550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 51641550 is about 7186.2055356078. The cubic root of 51641550 is about 372.3914973083.

It can be divided in two parts, 51 and 641550, that added together give a square (641601 = 801²).

The spelling of 51641550 in words is "fifty-one million, six hundred forty-one thousand, five hundred fifty".