91387001 has 2 divisors, whose sum is σ = 91387002. Its totient is φ = 91387000.

The previous prime is 91386989. The next prime is 91387007. The reversal of 91387001 is 10078319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60295225 + 31091776 = 7765^2 + 5576^2 .

It is a cyclic number.

It is not a de Polignac number, because 91387001 - 2¹⁸ = 91124857 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (91387007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45693500 + 45693501.

It is an arithmetic number, because the mean of its divisors is an integer number (45693501).

Almost surely, 2^91387001 is an apocalyptic number.

It is an amenable number.

91387001 is a deficient number, since it is larger than the sum of its proper divisors (1).

91387001 is an equidigital number, since it uses as much as digits as its factorization.

91387001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 91387001 is about 9559.6548577864. The cubic root of 91387001 is about 450.4308646915.

The spelling of 91387001 in words is "ninety-one million, three hundred eighty-seven thousand, one".