151531231517 has 4 divisors (see below), whose sum is σ = 151532118816. Its totient is φ = 151530344220.

The previous prime is 151531231483. The next prime is 151531231543. The reversal of 151531231517 is 715132135151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 151531231517 - 2¹⁴ = 151531215133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151531231417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97409 + ... + 559062.

It is an arithmetic number, because the mean of its divisors is an integer number (37883029704).

Almost surely, 2^151531231517 is an apocalyptic number.

It is an amenable number.

151531231517 is a deficient number, since it is larger than the sum of its proper divisors (887299).

151531231517 is an equidigital number, since it uses as much as digits as its factorization.

151531231517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887298.

The product of its digits is 15750, while the sum is 35.

Adding to 151531231517 its reverse (715132135151), we get a palindrome (866663366668).

The spelling of 151531231517 in words is "one hundred fifty-one billion, five hundred thirty-one million, two hundred thirty-one thousand, five hundred seventeen".