145247777 has 2 divisors, whose sum is σ = 145247778. Its totient is φ = 145247776.

The previous prime is 145247701. The next prime is 145247821. The reversal of 145247777 is 777742541.

It is an a-pointer prime, because the next prime (145247821) can be obtained adding 145247777 to its sum of digits (44).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142181776 + 3066001 = 11924^2 + 1751^2 .

It is a cyclic number.

It is not a de Polignac number, because 145247777 - 2⁸ = 145247521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145247477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72623888 + 72623889.

It is an arithmetic number, because the mean of its divisors is an integer number (72623889).

Almost surely, 2^145247777 is an apocalyptic number.

It is an amenable number.

145247777 is a deficient number, since it is larger than the sum of its proper divisors (1).

145247777 is an equidigital number, since it uses as much as digits as its factorization.

145247777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384160, while the sum is 44.

The square root of 145247777 is about 12051.8785672608. The cubic root of 145247777 is about 525.6578625329.

The spelling of 145247777 in words is "one hundred forty-five million, two hundred forty-seven thousand, seven hundred seventy-seven".