515221245 has 48 divisors (see below), whose sum is σ = 1113420672. Its totient is φ = 214116480.

The previous prime is 515221199. The next prime is 515221247. The reversal of 515221245 is 542122515.

515221245 is a `hidden beast` number, since 515 + 22 + 124 + 5 = 666.

It is not a de Polignac number, because 515221245 - 2⁷ = 515221117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515221247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70882 + ... + 77811.

It is an arithmetic number, because the mean of its divisors is an integer number (23196264).

Almost surely, 2^515221245 is an apocalyptic number.

515221245 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

515221245 is an abundant number, since it is smaller than the sum of its proper divisors (598199427).

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

515221245 is a wasteful number, since it uses less digits than its factorization.

515221245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148722 (or 148719 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 515221245 is about 22698.4855221665. The cubic root of 515221245 is about 801.6742255377.

It can be divided in two parts, 51 and 5221245, that added together give a triangular number (5221296 = T₃₂₃₁).

The spelling of 515221245 in words is "five hundred fifteen million, two hundred twenty-one thousand, two hundred forty-five".