51951510 has 192 divisors, whose sum is σ = 161300160. Its totient is φ = 11819520.

The previous prime is 51951479. The next prime is 51951511. The reversal of 51951510 is 1515915.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51951511) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1267090 + ... + 1267130.

It is an arithmetic number, because the mean of its divisors is an integer number (840105).

Almost surely, 2^51951510 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51951510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80650080).

51951510 is an abundant number, since it is smaller than the sum of its proper divisors (109348650).

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

51951510 is a wasteful number, since it uses less digits than its factorization.

51951510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 27.

The square root of 51951510 is about 7207.7395901905. The cubic root of 51951510 is about 373.1350607120.

The spelling of 51951510 in words is "fifty-one million, nine hundred fifty-one thousand, five hundred ten".