817072131406 has 4 divisors (see below), whose sum is σ = 1225608197112. Its totient is φ = 408536065702.

The previous prime is 817072131397. The next prime is 817072131457. The reversal of 817072131406 is 604131270718.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204268032850 + ... + 204268032853.

It is an arithmetic number, because the mean of its divisors is an integer number (306402049278).

Almost surely, 2^817072131406 is an apocalyptic number.

817072131406 is a deficient number, since it is larger than the sum of its proper divisors (408536065706).

817072131406 is a wasteful number, since it uses less digits than its factorization.

817072131406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408536065705.

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 817072131406 in words is "eight hundred seventeen billion, seventy-two million, one hundred thirty-one thousand, four hundred six".