1531458225421 has 2 divisors, whose sum is σ = 1531458225422. Its totient is φ = 1531458225420.

The previous prime is 1531458225379. The next prime is 1531458225457. The reversal of 1531458225421 is 1245228541351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1050635250025 + 480822975396 = 1025005^2 + 693414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531458225421 - 2⁷ = 1531458225293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531458222421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765729112710 + 765729112711.

It is an arithmetic number, because the mean of its divisors is an integer number (765729112711).

Almost surely, 2^{1531458225421} is an apocalyptic number.

It is an amenable number.

1531458225421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531458225421 is an equidigital number, since it uses as much as digits as its factorization.

1531458225421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384000, while the sum is 43.

The spelling of 1531458225421 in words is "one trillion, five hundred thirty-one billion, four hundred fifty-eight million, two hundred twenty-five thousand, four hundred twenty-one".