242815477 has 2 divisors, whose sum is σ = 242815478. Its totient is φ = 242815476.

The previous prime is 242815457. The next prime is 242815483. The reversal of 242815477 is 774518242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128731716 + 114083761 = 11346^2 + 10681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242815477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242815457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121407738 + 121407739.

It is an arithmetic number, because the mean of its divisors is an integer number (121407739).

Almost surely, 2^242815477 is an apocalyptic number.

It is an amenable number.

242815477 is a deficient number, since it is larger than the sum of its proper divisors (1).

242815477 is an equidigital number, since it uses as much as digits as its factorization.

242815477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 40.

The square root of 242815477 is about 15582.5375661347. The cubic root of 242815477 is about 623.8671549399.

The spelling of 242815477 in words is "two hundred forty-two million, eight hundred fifteen thousand, four hundred seventy-seven".