75140921 has 4 divisors (see below), whose sum is σ = 76739712. Its totient is φ = 73542132.

The previous prime is 75140911. The next prime is 75140939. The reversal of 75140921 is 12904157.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75140921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75140911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799325 + ... + 799418.

It is an arithmetic number, because the mean of its divisors is an integer number (19184928).

Almost surely, 2^75140921 is an apocalyptic number.

It is an amenable number.

75140921 is a deficient number, since it is larger than the sum of its proper divisors (1598791).

75140921 is a wasteful number, since it uses less digits than its factorization.

75140921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598790.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 75140921 is about 8668.3862973451. The cubic root of 75140921 is about 421.9802948954.

The spelling of 75140921 in words is "seventy-five million, one hundred forty thousand, nine hundred twenty-one".