213498981 has 12 divisors (see below), whose sum is σ = 308804652. Its totient is φ = 142140096.

The previous prime is 213498973. The next prime is 213498983. The reversal of 213498981 is 189894312.

It can be written as a sum of positive squares in 2 ways, for example, as 174636225 + 38862756 = 13215^2 + 6234^2 .

It is not a de Polignac number, because 213498981 - 2³ = 213498973 is a prime.

It is a super-2 number, since 2×213498981² = 91163629776076722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213498983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8856 + ... + 22481.

It is an arithmetic number, because the mean of its divisors is an integer number (25733721).

Almost surely, 2^213498981 is an apocalyptic number.

It is an amenable number.

213498981 is a deficient number, since it is larger than the sum of its proper divisors (95305671).

213498981 is a wasteful number, since it uses less digits than its factorization.

213498981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32100 (or 32097 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 213498981 is about 14611.6043266987. The cubic root of 213498981 is about 597.6752458302.

The spelling of 213498981 in words is "two hundred thirteen million, four hundred ninety-eight thousand, nine hundred eighty-one".