31618145327 has 4 divisors (see below), whose sum is σ = 31634974320. Its totient is φ = 31601316336.

The previous prime is 31618145297. The next prime is 31618145381. The reversal of 31618145327 is 72354181613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72354181613 = 7 ⋅10336311659.

It is a cyclic number.

It is not a de Polignac number, because 31618145327 - 2⁶ = 31618145263 is a prime.

It is a super-2 number, since 2×31618145327² (a number of 22 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 (31618145227) 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, 8411678 + ... + 8415435.

It is an arithmetic number, because the mean of its divisors is an integer number (7908743580).

Almost surely, 2^31618145327 is an apocalyptic number.

31618145327 is a deficient number, since it is larger than the sum of its proper divisors (16828993).

31618145327 is a wasteful number, since it uses less digits than its factorization.

31618145327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16828992.

The product of its digits is 120960, while the sum is 41.

The spelling of 31618145327 in words is "thirty-one billion, six hundred eighteen million, one hundred forty-five thousand, three hundred twenty-seven".