1291393867531 has 8 divisors (see below), whose sum is σ = 1312593878000. Its totient is φ = 1270194812640.

The previous prime is 1291393867451. The next prime is 1291393867541. The reversal of 1291393867531 is 1357683931921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291393867531 is a prime.

It is a super-2 number, since 2×1291393867531² (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 (1291393867541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2801020 + ... + 3229318.

It is an arithmetic number, because the mean of its divisors is an integer number (164074234750).

Almost surely, 2^{1291393867531} is an apocalyptic number.

1291393867531 is a deficient number, since it is larger than the sum of its proper divisors (21200010469).

1291393867531 is an equidigital number, since it uses as much as digits as its factorization.

1291393867531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477789.

The product of its digits is 7348320, while the sum is 58.

The spelling of 1291393867531 in words is "one trillion, two hundred ninety-one billion, three hundred ninety-three million, eight hundred sixty-seven thousand, five hundred thirty-one".