978293871431 has 4 divisors (see below), whose sum is σ = 978299737512. Its totient is φ = 978288005352.

The previous prime is 978293871421. The next prime is 978293871437. The reversal of 978293871431 is 134178392879.

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-978293871431 is a prime.

It is a super-2 number, since 2×978293871431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978293871437) 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, 2675336 + ... + 3018941.

It is an arithmetic number, because the mean of its divisors is an integer number (244574934378).

Almost surely, 2^978293871431 is an apocalyptic number.

978293871431 is a deficient number, since it is larger than the sum of its proper divisors (5866081).

978293871431 is a wasteful number, since it uses less digits than its factorization.

978293871431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5866080.

The product of its digits is 18289152, while the sum is 62.

The spelling of 978293871431 in words is "nine hundred seventy-eight billion, two hundred ninety-three million, eight hundred seventy-one thousand, four hundred thirty-one".