31423983931487 has 4 divisors (see below), whose sum is σ = 35913124493136. Its totient is φ = 26934843369840.

The previous prime is 31423983931427. The next prime is 31423983931507. The reversal of 31423983931487 is 78413938932413.

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

It is not a de Polignac number, because 31423983931487 - 2⁶ = 31423983931423 is a prime.

It is a super-2 number, since 2×31423983931487² (a number of 28 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 (31423983931427) 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, 2244570280814 + ... + 2244570280827.

It is an arithmetic number, because the mean of its divisors is an integer number (8978281123284).

Almost surely, 2^{31423983931487} is an apocalyptic number.

31423983931487 is a deficient number, since it is larger than the sum of its proper divisors (4489140561649).

31423983931487 is an equidigital number, since it uses as much as digits as its factorization.

31423983931487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489140561648.

The product of its digits is 94058496, while the sum is 65.

The spelling of 31423983931487 in words is "thirty-one trillion, four hundred twenty-three billion, nine hundred eighty-three million, nine hundred thirty-one thousand, four hundred eighty-seven".