1215461206531 has 16 divisors (see below), whose sum is σ = 1503109923840. Its totient is φ = 966284946720.

The previous prime is 1215461206511. The next prime is 1215461206537. The reversal of 1215461206531 is 1356021645121.

It is a cyclic number.

It is not a de Polignac number, because 1215461206531 - 2⁹ = 1215461206019 is a prime.

It is a super-2 number, since 2×1215461206531² (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 (1215461206537) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 223674355 + ... + 223679788.

It is an arithmetic number, because the mean of its divisors is an integer number (93944370240).

Almost surely, 2^{1215461206531} is an apocalyptic number.

1215461206531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1215461206531 is a deficient number, since it is larger than the sum of its proper divisors (287648717309).

1215461206531 is a wasteful number, since it uses less digits than its factorization.

1215461206531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447354186.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 1215461206531 in words is "one trillion, two hundred fifteen billion, four hundred sixty-one million, two hundred six thousand, five hundred thirty-one".