512921381 has 16 divisors (see below), whose sum is σ = 614154240. Its totient is φ = 419102640.

The previous prime is 512921341. The next prime is 512921393. The reversal of 512921381 is 183129215.

It is a happy number.

It is not a de Polignac number, because 512921381 - 2⁶ = 512921317 is a prime.

It is a super-2 number, since 2×512921381² = 526176686173894322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512921341) 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, 3101 + ... + 32178.

It is an arithmetic number, because the mean of its divisors is an integer number (38384640).

Almost surely, 2^512921381 is an apocalyptic number.

It is an amenable number.

512921381 is a deficient number, since it is larger than the sum of its proper divisors (101232859).

512921381 is a wasteful number, since it uses less digits than its factorization.

512921381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35384.

The product of its digits is 4320, while the sum is 32.

The square root of 512921381 is about 22647.7676824892. The cubic root of 512921381 is about 800.4795983618.

The spelling of 512921381 in words is "five hundred twelve million, nine hundred twenty-one thousand, three hundred eighty-one".