11531533425 has 24 divisors (see below), whose sum is σ = 19471122816. Its totient is φ = 6019295040.

The previous prime is 11531533411. The next prime is 11531533427. The reversal of 11531533425 is 52433513511.

It is not a de Polignac number, because 11531533425 - 2¹² = 11531529329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11531533427) 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 23 ways as a sum of consecutive naturals, for example, 1632154 + ... + 1639203.

It is an arithmetic number, because the mean of its divisors is an integer number (811296784).

Almost surely, 2^11531533425 is an apocalyptic number.

11531533425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11531533425 is a deficient number, since it is larger than the sum of its proper divisors (7939589391).

11531533425 is a wasteful number, since it uses less digits than its factorization.

11531533425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271417 (or 3271412 counting only the distinct ones).

The product of its digits is 27000, while the sum is 33.

The spelling of 11531533425 in words is "eleven billion, five hundred thirty-one million, five hundred thirty-three thousand, four hundred twenty-five".