131528977 has 2 divisors, whose sum is σ = 131528978. Its totient is φ = 131528976.

The previous prime is 131528911. The next prime is 131528981. The reversal of 131528977 is 779825131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92140801 + 39388176 = 9599^2 + 6276^2 .

It is a cyclic number.

It is not a de Polignac number, because 131528977 - 2¹¹ = 131526929 is a prime.

It is not a weakly prime, because it can be changed into another prime (131528077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65764488 + 65764489.

It is an arithmetic number, because the mean of its divisors is an integer number (65764489).

Almost surely, 2^131528977 is an apocalyptic number.

It is an amenable number.

131528977 is a deficient number, since it is larger than the sum of its proper divisors (1).

131528977 is an equidigital number, since it uses as much as digits as its factorization.

131528977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The square root of 131528977 is about 11468.6083288253. The cubic root of 131528977 is about 508.5579886215.

The spelling of 131528977 in words is "one hundred thirty-one million, five hundred twenty-eight thousand, nine hundred seventy-seven".