1612431650581 has 2 divisors, whose sum is σ = 1612431650582. Its totient is φ = 1612431650580.

The previous prime is 1612431650569. The next prime is 1612431650633. The reversal of 1612431650581 is 1850561342161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1513625787025 + 98805863556 = 1230295^2 + 314334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1612431650581 is a prime.

It is a super-2 number, since 2×1612431650581² (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 (1612431690581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806215825290 + 806215825291.

It is an arithmetic number, because the mean of its divisors is an integer number (806215825291).

Almost surely, 2^{1612431650581} is an apocalyptic number.

It is an amenable number.

1612431650581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1612431650581 is an equidigital number, since it uses as much as digits as its factorization.

1612431650581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 1612431650581 in words is "one trillion, six hundred twelve billion, four hundred thirty-one million, six hundred fifty thousand, five hundred eighty-one".