75253621 has 2 divisors, whose sum is σ = 75253622. Its totient is φ = 75253620.

The previous prime is 75253613. The next prime is 75253643. The reversal of 75253621 is 12635257.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75082225 + 171396 = 8665^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 75253621 - 2³ = 75253613 is a prime.

It is a super-2 number, since 2×75253621² = 11326214947223282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75253601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37626810 + 37626811.

It is an arithmetic number, because the mean of its divisors is an integer number (37626811).

Almost surely, 2^75253621 is an apocalyptic number.

It is an amenable number.

75253621 is a deficient number, since it is larger than the sum of its proper divisors (1).

75253621 is an equidigital number, since it uses as much as digits as its factorization.

75253621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 31.

The square root of 75253621 is about 8674.8844949083. The cubic root of 75253621 is about 422.1911583512.

Adding to 75253621 its reverse (12635257), we get a palindrome (87888878).

The spelling of 75253621 in words is "seventy-five million, two hundred fifty-three thousand, six hundred twenty-one".