51512274 has 80 divisors (see below), whose sum is σ = 127439136. Its totient is φ = 15422400.

The previous prime is 51512267. The next prime is 51512281. The reversal of 51512274 is 47221515.

It is an interprime number because it is at equal distance from previous prime (51512267) and next prime (51512281).

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 an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 244029 + ... + 244239.

Almost surely, 2^51512274 is an apocalyptic number.

51512274 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51512274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63719568).

51512274 is an abundant number, since it is smaller than the sum of its proper divisors (75926862).

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

51512274 is a wasteful number, since it uses less digits than its factorization.

51512274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 364 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 51512274 is about 7177.2051663583. The cubic root of 51512274 is about 372.0804976682.

Adding to 51512274 its reverse (47221515), we get a palindrome (98733789).

The spelling of 51512274 in words is "fifty-one million, five hundred twelve thousand, two hundred seventy-four".