31423645621145 has 4 divisors (see below), whose sum is σ = 37708374745380. Its totient is φ = 25138916496912.

The previous prime is 31423645621133. The next prime is 31423645621169. The reversal of 31423645621145 is 54112654632413.

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 13551314426521 + 17872331194624 = 3681211^2 + 4227568^2 .

It is a cyclic number.

It is not a de Polignac number, because 31423645621145 - 2¹⁶ = 31423645555609 is a prime.

It is a super-2 number, since 2×31423645621145² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31423645621145.

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, 3142364562110 + ... + 3142364562119.

It is an arithmetic number, because the mean of its divisors is an integer number (9427093686345).

Almost surely, 2^{31423645621145} is an apocalyptic number.

It is an amenable number.

31423645621145 is a deficient number, since it is larger than the sum of its proper divisors (6284729124235).

31423645621145 is an equidigital number, since it uses as much as digits as its factorization.

31423645621145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6284729124234.

The product of its digits is 2073600, while the sum is 47.

The spelling of 31423645621145 in words is "thirty-one trillion, four hundred twenty-three billion, six hundred forty-five million, six hundred twenty-one thousand, one hundred forty-five".