1231451151517 has 2 divisors, whose sum is σ = 1231451151518. Its totient is φ = 1231451151516.

The previous prime is 1231451151487. The next prime is 1231451151523. The reversal of 1231451151517 is 7151511541321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1020562632441 + 210888519076 = 1010229^2 + 459226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231451151517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231451151317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615725575758 + 615725575759.

It is an arithmetic number, because the mean of its divisors is an integer number (615725575759).

Almost surely, 2^{1231451151517} is an apocalyptic number.

It is an amenable number.

1231451151517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231451151517 is an equidigital number, since it uses as much as digits as its factorization.

1231451151517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 37.

Adding to 1231451151517 its reverse (7151511541321), we get a palindrome (8382962692838).

The spelling of 1231451151517 in words is "one trillion, two hundred thirty-one billion, four hundred fifty-one million, one hundred fifty-one thousand, five hundred seventeen".