535215981 has 16 divisors (see below), whose sum is σ = 756302400. Its totient is φ = 335509248.

The previous prime is 535215977. The next prime is 535216021. The reversal of 535215981 is 189512535.

It is not a de Polignac number, because 535215981 - 2² = 535215977 is a prime.

It is a super-2 number, since 2×535215981² = 572912292635584722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (535215481) 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, 58410 + ... + 66948.

It is an arithmetic number, because the mean of its divisors is an integer number (47268900).

Almost surely, 2^535215981 is an apocalyptic number.

535215981 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

535215981 is a deficient number, since it is larger than the sum of its proper divisors (221086419).

535215981 is a wasteful number, since it uses less digits than its factorization.

535215981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9788.

The product of its digits is 54000, while the sum is 39.

The square root of 535215981 is about 23134.7353777820. The cubic root of 535215981 is about 811.9133657682.

The spelling of 535215981 in words is "five hundred thirty-five million, two hundred fifteen thousand, nine hundred eighty-one".