31445743142885 has 4 divisors (see below), whose sum is σ = 37734891771468. Its totient is φ = 25156594514304.

The previous prime is 31445743142861. The next prime is 31445743142899. The reversal of 31445743142885 is 58824134754413.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18014405058244 + 13431338084641 = 4244338^2 + 3664879^2 .

It is a cyclic number.

It is not a de Polignac number, because 31445743142885 - 2¹⁶ = 31445743077349 is a prime.

It is a super-2 number, since 2×31445743142885² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 3144574314284 + ... + 3144574314293.

It is an arithmetic number, because the mean of its divisors is an integer number (9433722942867).

Almost surely, 2^{31445743142885} is an apocalyptic number.

It is an amenable number.

31445743142885 is a deficient number, since it is larger than the sum of its proper divisors (6289148628583).

31445743142885 is an equidigital number, since it uses as much as digits as its factorization.

31445743142885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289148628582.

The product of its digits is 51609600, while the sum is 59.

The spelling of 31445743142885 in words is "thirty-one trillion, four hundred forty-five billion, seven hundred forty-three million, one hundred forty-two thousand, eight hundred eighty-five".