31653117421 has 2 divisors, whose sum is σ = 31653117422. Its totient is φ = 31653117420.

The previous prime is 31653117413. The next prime is 31653117439. The reversal of 31653117421 is 12471135613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21290895396 + 10362222025 = 145914^2 + 101795^2 .

It is an emirp because it is prime and its reverse (12471135613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31653117421 - 2³ = 31653117413 is a prime.

It is a super-2 number, since 2×31653117421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31653117451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15826558710 + 15826558711.

It is an arithmetic number, because the mean of its divisors is an integer number (15826558711).

Almost surely, 2^31653117421 is an apocalyptic number.

It is an amenable number.

31653117421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31653117421 is an equidigital number, since it uses as much as digits as its factorization.

31653117421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The spelling of 31653117421 in words is "thirty-one billion, six hundred fifty-three million, one hundred seventeen thousand, four hundred twenty-one".