1621318325831 has 2 divisors, whose sum is σ = 1621318325832. Its totient is φ = 1621318325830.

The previous prime is 1621318325729. The next prime is 1621318325863. The reversal of 1621318325831 is 1385238131261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1621318325831 - 2³⁸ = 1346440418887 is a prime.

It is a super-2 number, since 2×1621318325831² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621318322831) 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, 810659162915 + 810659162916.

It is an arithmetic number, because the mean of its divisors is an integer number (810659162916).

Almost surely, 2^{1621318325831} is an apocalyptic number.

1621318325831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621318325831 is an equidigital number, since it uses as much as digits as its factorization.

1621318325831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 44.

The spelling of 1621318325831 in words is "one trillion, six hundred twenty-one billion, three hundred eighteen million, three hundred twenty-five thousand, eight hundred thirty-one".