1312241351531 has 4 divisors (see below), whose sum is σ = 1431536019864. Its totient is φ = 1192946683200.

The previous prime is 1312241351527. The next prime is 1312241351537. The reversal of 1312241351531 is 1351531422131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1312241351531 - 2² = 1312241351527 is a prime.

It is a super-2 number, since 2×1312241351531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312241351537) 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, 59647334150 + ... + 59647334171.

It is an arithmetic number, because the mean of its divisors is an integer number (357884004966).

Almost surely, 2^{1312241351531} is an apocalyptic number.

1312241351531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1312241351531 is a deficient number, since it is larger than the sum of its proper divisors (119294668333).

1312241351531 is a wasteful number, since it uses less digits than its factorization.

1312241351531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119294668332.

The product of its digits is 10800, while the sum is 32.

Adding to 1312241351531 its reverse (1351531422131), we get a palindrome (2663772773662).

The spelling of 1312241351531 in words is "one trillion, three hundred twelve billion, two hundred forty-one million, three hundred fifty-one thousand, five hundred thirty-one".