213515023 has 4 divisors (see below), whose sum is σ = 220877640. Its totient is φ = 206152408.

The previous prime is 213515017. The next prime is 213515051. The reversal of 213515023 is 320515312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213515023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213514985 and 213515003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213515083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3681265 + ... + 3681322.

It is an arithmetic number, because the mean of its divisors is an integer number (55219410).

Almost surely, 2^213515023 is an apocalyptic number.

213515023 is a deficient number, since it is larger than the sum of its proper divisors (7362617).

213515023 is an equidigital number, since it uses as much as digits as its factorization.

213515023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7362616.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 213515023 is about 14612.1532636364. The cubic root of 213515023 is about 597.6902149354.

The spelling of 213515023 in words is "two hundred thirteen million, five hundred fifteen thousand, twenty-three".