1012612397861 has 2 divisors, whose sum is σ = 1012612397862. Its totient is φ = 1012612397860.

The previous prime is 1012612397857. The next prime is 1012612397899. The reversal of 1012612397861 is 1687932162101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 707432388100 + 305180009761 = 841090^2 + 552431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012612397861 - 2² = 1012612397857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012612397161) 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, 506306198930 + 506306198931.

It is an arithmetic number, because the mean of its divisors is an integer number (506306198931).

Almost surely, 2^{1012612397861} is an apocalyptic number.

It is an amenable number.

1012612397861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012612397861 is an equidigital number, since it uses as much as digits as its factorization.

1012612397861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 1012612397861 in words is "one trillion, twelve billion, six hundred twelve million, three hundred ninety-seven thousand, eight hundred sixty-one".