513977381 has 8 divisors (see below), whose sum is σ = 519556800. Its totient is φ = 508425120.

The previous prime is 513977369. The next prime is 513977393. The reversal of 513977381 is 183779315.

It is an interprime number because it is at equal distance from previous prime (513977369) and next prime (513977393).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513977381 is a prime.

It is a super-2 number, since 2×513977381² = 528345496359238322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513977281) 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, 32480 + ... + 45638.

It is an arithmetic number, because the mean of its divisors is an integer number (64944600).

Almost surely, 2^513977381 is an apocalyptic number.

It is an amenable number.

513977381 is a deficient number, since it is larger than the sum of its proper divisors (5579419).

513977381 is a wasteful number, since it uses less digits than its factorization.

513977381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13579.

The product of its digits is 158760, while the sum is 44.

The square root of 513977381 is about 22671.0692513609. The cubic root of 513977381 is about 801.0285629436.

The spelling of 513977381 in words is "five hundred thirteen million, nine hundred seventy-seven thousand, three hundred eighty-one".