75371521 has 4 divisors (see below), whose sum is σ = 75728944. Its totient is φ = 75014100.

The previous prime is 75371467. The next prime is 75371531. The reversal of 75371521 is 12517357.

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 7-Lehmer number, since φ(75371521) divides (75371521-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 75371521 - 2¹¹ = 75369473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75371531) 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, 178395 + ... + 178816.

It is an arithmetic number, because the mean of its divisors is an integer number (18932236).

Almost surely, 2^75371521 is an apocalyptic number.

It is an amenable number.

75371521 is a deficient number, since it is larger than the sum of its proper divisors (357423).

75371521 is a wasteful number, since it uses less digits than its factorization.

75371521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357422.

The product of its digits is 7350, while the sum is 31.

The square root of 75371521 is about 8681.6773148972. The cubic root of 75371521 is about 422.4115258880.

Adding to 75371521 its reverse (12517357), we get a palindrome (87888878).

The spelling of 75371521 in words is "seventy-five million, three hundred seventy-one thousand, five hundred twenty-one".