213500031 has 8 divisors (see below), whose sum is σ = 291287040. Its totient is φ = 139023192.

The previous prime is 213500009. The next prime is 213500041. The reversal of 213500031 is 130005312.

It is a happy number.

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

It is not a de Polignac number, because 213500031 - 2⁶ = 213499967 is a prime.

It is a super-2 number, since 2×213500031² = 91164526474001922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213500041) 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, 827391 + ... + 827648.

It is an arithmetic number, because the mean of its divisors is an integer number (36410880).

Almost surely, 2^213500031 is an apocalyptic number.

213500031 is a deficient number, since it is larger than the sum of its proper divisors (77787009).

213500031 is a wasteful number, since it uses less digits than its factorization.

213500031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655085.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 213500031 is about 14611.6402570006. The cubic root of 213500031 is about 597.6762256287.

Adding to 213500031 its reverse (130005312), we get a palindrome (343505343).

The spelling of 213500031 in words is "two hundred thirteen million, five hundred thousand, thirty-one".