7540505921 has 8 divisors (see below), whose sum is σ = 8121220800. Its totient is φ = 6959887632.

The previous prime is 7540505899. The next prime is 7540505953. The reversal of 7540505921 is 1295050457.

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 a de Polignac number, because none of the positive numbers 2^k-7540505921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7540505971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279380 + ... + 305178.

It is an arithmetic number, because the mean of its divisors is an integer number (1015152600).

Almost surely, 2^7540505921 is an apocalyptic number.

It is an amenable number.

7540505921 is a deficient number, since it is larger than the sum of its proper divisors (580714879).

7540505921 is a wasteful number, since it uses less digits than its factorization.

7540505921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48295.

The product of its (nonzero) digits is 63000, while the sum is 38.

The square root of 7540505921 is about 86836.0865136148. The cubic root of 7540505921 is about 1960.9513915973.

The spelling of 7540505921 in words is "seven billion, five hundred forty million, five hundred five thousand, nine hundred twenty-one".