1331642077 has 2 divisors, whose sum is σ = 1331642078. Its totient is φ = 1331642076.

The previous prime is 1331642057. The next prime is 1331642083. The reversal of 1331642077 is 7702461331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 880249561 + 451392516 = 29669^2 + 21246^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331642077 - 2²³ = 1323253469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331642057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665821038 + 665821039.

It is an arithmetic number, because the mean of its divisors is an integer number (665821039).

Almost surely, 2^1331642077 is an apocalyptic number.

It is an amenable number.

1331642077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331642077 is an equidigital number, since it uses as much as digits as its factorization.

1331642077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 1331642077 is about 36491.6713374436. The cubic root of 1331642077 is about 1100.1768522813.

The spelling of 1331642077 in words is "one billion, three hundred thirty-one million, six hundred forty-two thousand, seventy-seven".