513161540 has 24 divisors (see below), whose sum is σ = 1089751320. Its totient is φ = 202957568.

The previous prime is 513161483. The next prime is 513161543. The reversal of 513161540 is 45161315.

It can be written as a sum of positive squares in 4 ways, for example, as 8620096 + 504541444 = 2936^2 + 22462^2 .

It is a super-2 number, since 2×513161540² = 526669532270343200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (513161543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142367 + ... + 145926.

It is an arithmetic number, because the mean of its divisors is an integer number (45406305).

Almost surely, 2^513161540 is an apocalyptic number.

It is an amenable number.

513161540 is an abundant number, since it is smaller than the sum of its proper divisors (576589780).

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

513161540 is a wasteful number, since it uses less digits than its factorization.

513161540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288391 (or 288389 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 513161540 is about 22653.0691077390. The cubic root of 513161540 is about 800.6045118417.

The spelling of 513161540 in words is "five hundred thirteen million, one hundred sixty-one thousand, five hundred forty".