1531145523551 has 8 divisors (see below), whose sum is σ = 1749898496544. Its totient is φ = 1312397025120.

The previous prime is 1531145523541. The next prime is 1531145523571. The reversal of 1531145523551 is 1553255411351.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1531145523551 - 2³⁰ = 1530071781727 is a prime.

It is a super-2 number, since 2×1531145523551² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1531145523499 and 1531145523508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531145523541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350180 + ... + 1784633.

It is an arithmetic number, because the mean of its divisors is an integer number (218737312068).

Almost surely, 2^{1531145523551} is an apocalyptic number.

1531145523551 is a deficient number, since it is larger than the sum of its proper divisors (218752972993).

1531145523551 is a wasteful number, since it uses less digits than its factorization.

1531145523551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237281.

The product of its digits is 225000, while the sum is 41.

The spelling of 1531145523551 in words is "one trillion, five hundred thirty-one billion, one hundred forty-five million, five hundred twenty-three thousand, five hundred fifty-one".