145777213 has 2 divisors, whose sum is σ = 145777214. Its totient is φ = 145777212.

The previous prime is 145777211. The next prime is 145777217. The reversal of 145777213 is 312777541.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141562404 + 4214809 = 11898^2 + 2053^2 .

It is an emirp because it is prime and its reverse (312777541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145777213 - 2¹ = 145777211 is a prime.

Together with 145777211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145777211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72888606 + 72888607.

It is an arithmetic number, because the mean of its divisors is an integer number (72888607).

Almost surely, 2^145777213 is an apocalyptic number.

It is an amenable number.

145777213 is a deficient number, since it is larger than the sum of its proper divisors (1).

145777213 is an equidigital number, since it uses as much as digits as its factorization.

145777213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41160, while the sum is 37.

The square root of 145777213 is about 12073.8234623503. The cubic root of 145777213 is about 526.2957718645.

The spelling of 145777213 in words is "one hundred forty-five million, seven hundred seventy-seven thousand, two hundred thirteen".