515049981 has 8 divisors (see below), whose sum is σ = 686845920. Its totient is φ = 343310352.

The previous prime is 515049973. The next prime is 515049989. The reversal of 515049981 is 189940515.

It is an interprime number because it is at equal distance from previous prime (515049973) and next prime (515049989).

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

It is not a de Polignac number, because 515049981 - 2³ = 515049973 is a prime.

It is a super-2 number, since 2×515049981² = 530552965856200722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515049989) 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, 17190 + ... + 36408.

It is an arithmetic number, because the mean of its divisors is an integer number (85855740).

Almost surely, 2^515049981 is an apocalyptic number.

It is an amenable number.

515049981 is a deficient number, since it is larger than the sum of its proper divisors (171795939).

515049981 is a wasteful number, since it uses less digits than its factorization.

515049981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28155.

The product of its (nonzero) digits is 64800, while the sum is 42.

The square root of 515049981 is about 22694.7126221065. The cubic root of 515049981 is about 801.5853878770.

The spelling of 515049981 in words is "five hundred fifteen million, forty-nine thousand, nine hundred eighty-one".