145205777 has 2 divisors, whose sum is σ = 145205778. Its totient is φ = 145205776.

The previous prime is 145205773. The next prime is 145205783. The reversal of 145205777 is 777502541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143256961 + 1948816 = 11969^2 + 1396^2 .

It is an emirp because it is prime and its reverse (777502541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145205777 - 2² = 145205773 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145205777.

It is not a weakly prime, because it can be changed into another prime (145205773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72602888 + 72602889.

It is an arithmetic number, because the mean of its divisors is an integer number (72602889).

Almost surely, 2^145205777 is an apocalyptic number.

It is an amenable number.

145205777 is a deficient number, since it is larger than the sum of its proper divisors (1).

145205777 is an equidigital number, since it uses as much as digits as its factorization.

145205777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68600, while the sum is 38.

The square root of 145205777 is about 12050.1359743366. The cubic root of 145205777 is about 525.6071910550.

The spelling of 145205777 in words is "one hundred forty-five million, two hundred five thousand, seven hundred seventy-seven".