1531215400345 has 8 divisors (see below), whose sum is σ = 1837505479176. Its totient is φ = 1224940987776.

The previous prime is 1531215400327. The next prime is 1531215400357. The reversal of 1531215400345 is 5430045121351.

It can be written as a sum of positive squares in 4 ways, for example, as 510234490249 + 1020980910096 = 714307^2 + 1010436^2 .

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 1531215400345 - 2¹³ = 1531215392153 is a prime.

It is a super-2 number, since 2×1531215400345² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1531215400345.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3700452 + ... + 4093381.

It is an arithmetic number, because the mean of its divisors is an integer number (229688184897).

Almost surely, 2^{1531215400345} is an apocalyptic number.

It is an amenable number.

1531215400345 is a deficient number, since it is larger than the sum of its proper divisors (306290078831).

1531215400345 is an equidigital number, since it uses as much as digits as its factorization.

1531215400345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7833131.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 1531215400345 in words is "one trillion, five hundred thirty-one billion, two hundred fifteen million, four hundred thousand, three hundred forty-five".