1531200420247 has 2 divisors, whose sum is σ = 1531200420248. Its totient is φ = 1531200420246.

The previous prime is 1531200420229. The next prime is 1531200420307. The reversal of 1531200420247 is 7420240021351.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1531200420247 - 2³⁵ = 1496840681879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531200420647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765600210123 + 765600210124.

It is an arithmetic number, because the mean of its divisors is an integer number (765600210124).

Almost surely, 2^{1531200420247} is an apocalyptic number.

1531200420247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531200420247 is an equidigital number, since it uses as much as digits as its factorization.

1531200420247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 31.

Adding to 1531200420247 its reverse (7420240021351), we get a palindrome (8951440441598).

The spelling of 1531200420247 in words is "one trillion, five hundred thirty-one billion, two hundred million, four hundred twenty thousand, two hundred forty-seven".