75197621 has 2 divisors, whose sum is σ = 75197622. Its totient is φ = 75197620.

The previous prime is 75197597. The next prime is 75197641. The reversal of 75197621 is 12679157.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72760900 + 2436721 = 8530^2 + 1561^2 .

It is an emirp because it is prime and its reverse (12679157) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75197621 - 2¹⁸ = 74935477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75197641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37598810 + 37598811.

It is an arithmetic number, because the mean of its divisors is an integer number (37598811).

Almost surely, 2^75197621 is an apocalyptic number.

It is an amenable number.

75197621 is a deficient number, since it is larger than the sum of its proper divisors (1).

75197621 is an equidigital number, since it uses as much as digits as its factorization.

75197621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 38.

The square root of 75197621 is about 8671.6561855277. The cubic root of 75197621 is about 422.0864078132.

The spelling of 75197621 in words is "seventy-five million, one hundred ninety-seven thousand, six hundred twenty-one".