145120091 has 2 divisors, whose sum is σ = 145120092. Its totient is φ = 145120090.

The previous prime is 145120049. The next prime is 145120121. The reversal of 145120091 is 190021541.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (190021541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145120091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145120291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72560045 + 72560046.

It is an arithmetic number, because the mean of its divisors is an integer number (72560046).

Almost surely, 2^145120091 is an apocalyptic number.

145120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

145120091 is an equidigital number, since it uses as much as digits as its factorization.

145120091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 145120091 is about 12046.5800541066. The cubic root of 145120091 is about 525.5037836919.

The spelling of 145120091 in words is "one hundred forty-five million, one hundred twenty thousand, ninety-one".