75021091 has 2 divisors, whose sum is σ = 75021092. Its totient is φ = 75021090.

The previous prime is 75021077. The next prime is 75021097. The reversal of 75021091 is 19012057.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 75021091 - 2⁹ = 75020579 is a prime.

It is not a weakly prime, because it can be changed into another prime (75021097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37510545 + 37510546.

It is an arithmetic number, because the mean of its divisors is an integer number (37510546).

Almost surely, 2^75021091 is an apocalyptic number.

75021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

75021091 is an equidigital number, since it uses as much as digits as its factorization.

75021091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 75021091 is about 8661.4716417015. The cubic root of 75021091 is about 421.7558596978.

The spelling of 75021091 in words is "seventy-five million, twenty-one thousand, ninety-one".