813217142 has 4 divisors (see below), whose sum is σ = 1219825716. Its totient is φ = 406608570.

The previous prime is 813217129. The next prime is 813217189. The reversal of 813217142 is 241712318.

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

It is a super-2 number, since 2×813217142² = 1322644240085296328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203304284 + ... + 203304287.

It is an arithmetic number, because the mean of its divisors is an integer number (304956429).

Almost surely, 2^813217142 is an apocalyptic number.

813217142 is a deficient number, since it is larger than the sum of its proper divisors (406608574).

813217142 is a wasteful number, since it uses less digits than its factorization.

813217142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406608573.

The product of its digits is 2688, while the sum is 29.

The square root of 813217142 is about 28516.9623557629. The cubic root of 813217142 is about 933.4022459605.

The spelling of 813217142 in words is "eight hundred thirteen million, two hundred seventeen thousand, one hundred forty-two".