75491261 has 2 divisors, whose sum is σ = 75491262. Its totient is φ = 75491260.

The previous prime is 75491249. The next prime is 75491287. The reversal of 75491261 is 16219457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74063236 + 1428025 = 8606^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 75491261 - 2⁶ = 75491197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75491201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37745630 + 37745631.

It is an arithmetic number, because the mean of its divisors is an integer number (37745631).

Almost surely, 2^75491261 is an apocalyptic number.

It is an amenable number.

75491261 is a deficient number, since it is larger than the sum of its proper divisors (1).

75491261 is an equidigital number, since it uses as much as digits as its factorization.

75491261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 75491261 is about 8688.5707109973. The cubic root of 75491261 is about 422.6350974900.

The spelling of 75491261 in words is "seventy-five million, four hundred ninety-one thousand, two hundred sixty-one".