213561715 has 4 divisors (see below), whose sum is σ = 256274064. Its totient is φ = 170849368.

The previous prime is 213561709. The next prime is 213561721. The reversal of 213561715 is 517165312.

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

It is an interprime number because it is at equal distance from previous prime (213561709) and next prime (213561721).

It is a cyclic number.

It is not a de Polignac number, because 213561715 - 2³ = 213561707 is a prime.

It is a super-2 number, since 2×213561715² = 91217212227482450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21356167 + ... + 21356176.

It is an arithmetic number, because the mean of its divisors is an integer number (64068516).

Almost surely, 2^213561715 is an apocalyptic number.

213561715 is a deficient number, since it is larger than the sum of its proper divisors (42712349).

213561715 is an equidigital number, since it uses as much as digits as its factorization.

213561715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42712348.

The product of its digits is 6300, while the sum is 31.

The square root of 213561715 is about 14613.7508874348. The cubic root of 213561715 is about 597.7337798910.

The spelling of 213561715 in words is "two hundred thirteen million, five hundred sixty-one thousand, seven hundred fifteen".