513814171981 has 8 divisors (see below), whose sum is σ = 575673863904. Its totient is φ = 454479365520.

The previous prime is 513814171963. The next prime is 513814171987. The reversal of 513814171981 is 189171418315.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 513814171981 - 2⁹ = 513814171469 is a prime.

It is a super-2 number, since 2×513814171981² (a number of 24 digits) 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 (513814171987) 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, 631220935 + ... + 631221748.

It is an arithmetic number, because the mean of its divisors is an integer number (71959232988).

Almost surely, 2^513814171981 is an apocalyptic number.

It is an amenable number.

513814171981 is a deficient number, since it is larger than the sum of its proper divisors (61859691923).

513814171981 is a wasteful number, since it uses less digits than its factorization.

513814171981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262442731.

The product of its digits is 241920, while the sum is 49.

The spelling of 513814171981 in words is "five hundred thirteen billion, eight hundred fourteen million, one hundred seventy-one thousand, nine hundred eighty-one".