1521049665531 has 32 divisors (see below), whose sum is σ = 2215524250368. Its totient is φ = 920562330240.

The previous prime is 1521049665481. The next prime is 1521049665599. The reversal of 1521049665531 is 1355669401251.

It is not a de Polignac number, because 1521049665531 - 2¹³ = 1521049657339 is a prime.

It is a super-2 number, since 2×1521049665531² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1521049664531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82670025 + ... + 82688421.

It is an arithmetic number, because the mean of its divisors is an integer number (69235132824).

Almost surely, 2^{1521049665531} is an apocalyptic number.

1521049665531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1521049665531 is a deficient number, since it is larger than the sum of its proper divisors (694474584837).

1521049665531 is a wasteful number, since it uses less digits than its factorization.

1521049665531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21771.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 1521049665531 in words is "one trillion, five hundred twenty-one billion, forty-nine million, six hundred sixty-five thousand, five hundred thirty-one".