51019950 has 48 divisors (see below), whose sum is σ = 127491840. Its totient is φ = 13501920.

The previous prime is 51019933. The next prime is 51019951. The reversal of 51019950 is 5991015.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51019951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19627 + ... + 22073.

It is an arithmetic number, because the mean of its divisors is an integer number (2656080).

Almost surely, 2^51019950 is an apocalyptic number.

51019950 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 51019950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63745920).

51019950 is an abundant number, since it is smaller than the sum of its proper divisors (76471890).

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

51019950 is a wasteful number, since it uses less digits than its factorization.

51019950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601 (or 2596 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 30.

The square root of 51019950 is about 7142.8250713566. The cubic root of 51019950 is about 370.8913256385.

It can be divided in two parts, 5101 and 9950, that added together give a palindrome (15051).

The spelling of 51019950 in words is "fifty-one million, nineteen thousand, nine hundred fifty".