1231430045557 has 2 divisors, whose sum is σ = 1231430045558. Its totient is φ = 1231430045556.

The previous prime is 1231430045467. The next prime is 1231430045563. The reversal of 1231430045557 is 7555400341321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 983252711281 + 248177334276 = 991591^2 + 498174^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231430045557 - 2³¹ = 1229282561909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231430045357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615715022778 + 615715022779.

It is an arithmetic number, because the mean of its divisors is an integer number (615715022779).

Almost surely, 2^{1231430045557} is an apocalyptic number.

It is an amenable number.

1231430045557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231430045557 is an equidigital number, since it uses as much as digits as its factorization.

1231430045557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252000, while the sum is 40.

Adding to 1231430045557 its reverse (7555400341321), we get a palindrome (8786830386878).

The spelling of 1231430045557 in words is "one trillion, two hundred thirty-one billion, four hundred thirty million, forty-five thousand, five hundred fifty-seven".