131223737 has 2 divisors, whose sum is σ = 131223738. Its totient is φ = 131223736.

The previous prime is 131223613. The next prime is 131223761. The reversal of 131223737 is 737322131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103144336 + 28079401 = 10156^2 + 5299^2 .

It is a cyclic number.

It is not a de Polignac number, because 131223737 - 2¹⁶ = 131158201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131223767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65611868 + 65611869.

It is an arithmetic number, because the mean of its divisors is an integer number (65611869).

Almost surely, 2^131223737 is an apocalyptic number.

It is an amenable number.

131223737 is a deficient number, since it is larger than the sum of its proper divisors (1).

131223737 is an equidigital number, since it uses as much as digits as its factorization.

131223737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 29.

The square root of 131223737 is about 11455.2929687547. The cubic root of 131223737 is about 508.1642794891.

Adding to 131223737 its reverse (737322131), we get a palindrome (868545868).

The spelling of 131223737 in words is "one hundred thirty-one million, two hundred twenty-three thousand, seven hundred thirty-seven".