1245940117 has 4 divisors (see below), whose sum is σ = 1246063840. Its totient is φ = 1245816396.

The previous prime is 1245940099. The next prime is 1245940151. The reversal of 1245940117 is 7110495421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7110495421 = 131 ⋅54278591.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245940117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245940187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45273 + ... + 67390.

It is an arithmetic number, because the mean of its divisors is an integer number (311515960).

Almost surely, 2^1245940117 is an apocalyptic number.

It is an amenable number.

1245940117 is a deficient number, since it is larger than the sum of its proper divisors (123723).

1245940117 is a wasteful number, since it uses less digits than its factorization.

1245940117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123722.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 1245940117 is about 35297.8769474879. The cubic root of 1245940117 is about 1076.0498464238.

The spelling of 1245940117 in words is "one billion, two hundred forty-five million, nine hundred forty thousand, one hundred seventeen".