75715421 has 4 divisors (see below), whose sum is σ = 75769692. Its totient is φ = 75661152.

The previous prime is 75715411. The next prime is 75715459. The reversal of 75715421 is 12451757.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12451757 = 47 ⋅264931.

It can be written as a sum of positive squares in 2 ways, for example, as 23716900 + 51998521 = 4870^2 + 7211^2 .

It is a cyclic number.

It is not a de Polignac number, because 75715421 - 2¹⁴ = 75699037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75715411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24986 + ... + 27851.

It is an arithmetic number, because the mean of its divisors is an integer number (18942423).

Almost surely, 2^75715421 is an apocalyptic number.

It is an amenable number.

75715421 is a deficient number, since it is larger than the sum of its proper divisors (54271).

75715421 is a wasteful number, since it uses less digits than its factorization.

75715421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54270.

The product of its digits is 9800, while the sum is 32.

The square root of 75715421 is about 8701.4608543623. The cubic root of 75715421 is about 423.0530013489.

The spelling of 75715421 in words is "seventy-five million, seven hundred fifteen thousand, four hundred twenty-one".