515151312 has 80 divisors (see below), whose sum is σ = 1436366400. Its totient is φ = 158155776.

The previous prime is 515151271. The next prime is 515151317. The reversal of 515151312 is 213151515.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515151317) 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, 490564 + ... + 491612.

It is an arithmetic number, because the mean of its divisors is an integer number (17954580).

Almost surely, 2^515151312 is an apocalyptic number.

515151312 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 515151312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (718183200).

515151312 is an abundant number, since it is smaller than the sum of its proper divisors (921215088).

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

515151312 is a wasteful number, since it uses less digits than its factorization.

515151312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860 (or 1854 counting only the distinct ones).

The product of its digits is 750, while the sum is 24.

The square root of 515151312 is about 22696.9449926637. The cubic root of 515151312 is about 801.6379524343.

The spelling of 515151312 in words is "five hundred fifteen million, one hundred fifty-one thousand, three hundred twelve".