1242495817 has 2 divisors, whose sum is σ = 1242495818. Its totient is φ = 1242495816.

The previous prime is 1242495791. The next prime is 1242495827. The reversal of 1242495817 is 7185942421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 969948736 + 272547081 = 31144^2 + 16509^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242495817 - 2⁷ = 1242495689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242495827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621247908 + 621247909.

It is an arithmetic number, because the mean of its divisors is an integer number (621247909).

Almost surely, 2^1242495817 is an apocalyptic number.

It is an amenable number.

1242495817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242495817 is an equidigital number, since it uses as much as digits as its factorization.

1242495817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 1242495817 is about 35249.0541291536. The cubic root of 1242495817 is about 1075.0573806040.

It can be divided in two parts, 12424 and 95817, that added together give a square (108241 = 329²).

The spelling of 1242495817 in words is "one billion, two hundred forty-two million, four hundred ninety-five thousand, eight hundred seventeen".