75612421 has 2 divisors, whose sum is σ = 75612422. Its totient is φ = 75612420.

The previous prime is 75612409. The next prime is 75612443. The reversal of 75612421 is 12421657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74632321 + 980100 = 8639^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 75612421 - 2⁵ = 75612389 is a prime.

It is equal to p_4428118 and since 75612421 and 4428118 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75612421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75612491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37806210 + 37806211.

It is an arithmetic number, because the mean of its divisors is an integer number (37806211).

Almost surely, 2^75612421 is an apocalyptic number.

It is an amenable number.

75612421 is a deficient number, since it is larger than the sum of its proper divisors (1).

75612421 is an equidigital number, since it uses as much as digits as its factorization.

75612421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 28.

The square root of 75612421 is about 8695.5402937368. The cubic root of 75612421 is about 422.8610799303.

The spelling of 75612421 in words is "seventy-five million, six hundred twelve thousand, four hundred twenty-one".