1231340211461 has 2 divisors, whose sum is σ = 1231340211462. Its totient is φ = 1231340211460.

The previous prime is 1231340211457. The next prime is 1231340211509. The reversal of 1231340211461 is 1641120431321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 956276675236 + 275063536225 = 977894^2 + 524465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231340211461 - 2² = 1231340211457 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231340211061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615670105730 + 615670105731.

It is an arithmetic number, because the mean of its divisors is an integer number (615670105731).

Almost surely, 2^{1231340211461} is an apocalyptic number.

It is an amenable number.

1231340211461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231340211461 is an equidigital number, since it uses as much as digits as its factorization.

1231340211461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 1231340211461 its reverse (1641120431321), we get a palindrome (2872460642782).

The spelling of 1231340211461 in words is "one trillion, two hundred thirty-one billion, three hundred forty million, two hundred eleven thousand, four hundred sixty-one".