131218739 has 2 divisors, whose sum is σ = 131218740. Its totient is φ = 131218738.

The previous prime is 131218727. The next prime is 131218771. The reversal of 131218739 is 937812131.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (937812131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131218739 - 2⁴ = 131218723 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 131218699 and 131218708.

It is not a weakly prime, because it can be changed into another prime (131218709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65609369 + 65609370.

It is an arithmetic number, because the mean of its divisors is an integer number (65609370).

Almost surely, 2^131218739 is an apocalyptic number.

131218739 is a deficient number, since it is larger than the sum of its proper divisors (1).

131218739 is an equidigital number, since it uses as much as digits as its factorization.

131218739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 131218739 is about 11455.0748142472. The cubic root of 131218739 is about 508.1578278177.

The spelling of 131218739 in words is "one hundred thirty-one million, two hundred eighteen thousand, seven hundred thirty-nine".