145722991 has 2 divisors, whose sum is σ = 145722992. Its totient is φ = 145722990.

The previous prime is 145722943. The next prime is 145723021. The reversal of 145722991 is 199227541.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145722991 - 2¹³ = 145714799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145722911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72861495 + 72861496.

It is an arithmetic number, because the mean of its divisors is an integer number (72861496).

Almost surely, 2^145722991 is an apocalyptic number.

145722991 is a deficient number, since it is larger than the sum of its proper divisors (1).

145722991 is an equidigital number, since it uses as much as digits as its factorization.

145722991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 145722991 is about 12071.5778173361. The cubic root of 145722991 is about 526.2305116692.

The spelling of 145722991 in words is "one hundred forty-five million, seven hundred twenty-two thousand, nine hundred ninety-one".