531951271997 has 2 divisors, whose sum is σ = 531951271998. Its totient is φ = 531951271996.

The previous prime is 531951271993. The next prime is 531951272081. The reversal of 531951271997 is 799172159135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 269247869881 + 262703402116 = 518891^2 + 512546^2 .

It is a cyclic number.

It is not a de Polignac number, because 531951271997 - 2² = 531951271993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531951271993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265975635998 + 265975635999.

It is an arithmetic number, because the mean of its divisors is an integer number (265975635999).

Almost surely, 2^531951271997 is an apocalyptic number.

It is an amenable number.

531951271997 is a deficient number, since it is larger than the sum of its proper divisors (1).

531951271997 is an equidigital number, since it uses as much as digits as its factorization.

531951271997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5358150, while the sum is 59.

The spelling of 531951271997 in words is "five hundred thirty-one billion, nine hundred fifty-one million, two hundred seventy-one thousand, nine hundred ninety-seven".