131777531 has 2 divisors, whose sum is σ = 131777532. Its totient is φ = 131777530.

The previous prime is 131777501. The next prime is 131777551. The reversal of 131777531 is 135777131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131777531 - 2⁶ = 131777467 is a prime.

It is a super-2 number, since 2×131777531² = 34730635352911922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 131777491 and 131777500.

It is not a weakly prime, because it can be changed into another prime (131777501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65888765 + 65888766.

It is an arithmetic number, because the mean of its divisors is an integer number (65888766).

Almost surely, 2^131777531 is an apocalyptic number.

131777531 is a deficient number, since it is larger than the sum of its proper divisors (1).

131777531 is an equidigital number, since it uses as much as digits as its factorization.

131777531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15435, while the sum is 35.

The square root of 131777531 is about 11479.4394898009. The cubic root of 131777531 is about 508.8781324802.

The spelling of 131777531 in words is "one hundred thirty-one million, seven hundred seventy-seven thousand, five hundred thirty-one".