75421381 has 4 divisors (see below), whose sum is σ = 86195872. Its totient is φ = 64646892.

The previous prime is 75421361. The next prime is 75421391. The reversal of 75421381 is 18312457.

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 not a de Polignac number, because 75421381 - 2⁵ = 75421349 is a prime.

It is a super-2 number, since 2×75421381² = 11376769423894322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75421321) 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, 5387235 + ... + 5387248.

It is an arithmetic number, because the mean of its divisors is an integer number (21548968).

Almost surely, 2^75421381 is an apocalyptic number.

It is an amenable number.

75421381 is a deficient number, since it is larger than the sum of its proper divisors (10774491).

75421381 is a wasteful number, since it uses less digits than its factorization.

75421381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10774490.

The product of its digits is 6720, while the sum is 31.

The square root of 75421381 is about 8684.5484050698. The cubic root of 75421381 is about 422.5046503462.

The spelling of 75421381 in words is "seventy-five million, four hundred twenty-one thousand, three hundred eighty-one".