106321591 has 2 divisors, whose sum is σ = 106321592. Its totient is φ = 106321590.

The previous prime is 106321573. The next prime is 106321613. The reversal of 106321591 is 195123601.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 106321591 - 2⁵ = 106321559 is a prime.

It is a super-2 number, since 2×106321591² = 22608561425542562, which contains 22 as substring.

It is equal to p_6104188 and since 106321591 and 6104188 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106321531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53160795 + 53160796.

It is an arithmetic number, because the mean of its divisors is an integer number (53160796).

Almost surely, 2^106321591 is an apocalyptic number.

106321591 is a deficient number, since it is larger than the sum of its proper divisors (1).

106321591 is an equidigital number, since it uses as much as digits as its factorization.

106321591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 106321591 is about 10311.2361528577. The cubic root of 106321591 is about 473.7404725611.

The spelling of 106321591 in words is "one hundred six million, three hundred twenty-one thousand, five hundred ninety-one".