75021913 has 4 divisors (see below), whose sum is σ = 75220240. Its totient is φ = 74823588.

The previous prime is 75021907. The next prime is 75021931. The reversal of 75021913 is 31912057.

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-75021913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75021413) 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, 98595 + ... + 99352.

It is an arithmetic number, because the mean of its divisors is an integer number (18805060).

Almost surely, 2^75021913 is an apocalyptic number.

It is an amenable number.

75021913 is a deficient number, since it is larger than the sum of its proper divisors (198327).

75021913 is a wasteful number, since it uses less digits than its factorization.

75021913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198326.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 75021913 is about 8661.5190930922. The cubic root of 75021913 is about 421.7574000737.

The spelling of 75021913 in words is "seventy-five million, twenty-one thousand, nine hundred thirteen".