131777777 has 2 divisors, whose sum is σ = 131777778. Its totient is φ = 131777776.

The previous prime is 131777759. The next prime is 131777797. The reversal of 131777777 is 777777131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128958736 + 2819041 = 11356^2 + 1679^2 .

It is a cyclic number.

It is not a de Polignac number, because 131777777 - 2⁶ = 131777713 is a prime.

It is a super-2 number, since 2×131777777² = 34730765022123458, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131777797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65888888 + 65888889.

It is an arithmetic number, because the mean of its divisors is an integer number (65888889).

Almost surely, 2^131777777 is an apocalyptic number.

It is an amenable number.

131777777 is a deficient number, since it is larger than the sum of its proper divisors (1).

131777777 is an equidigital number, since it uses as much as digits as its factorization.

131777777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352947, while the sum is 47.

The square root of 131777777 is about 11479.4502046047. The cubic root of 131777777 is about 508.8784491349.

The spelling of 131777777 in words is "one hundred thirty-one million, seven hundred seventy-seven thousand, seven hundred seventy-seven".