1641008977 has 2 divisors, whose sum is σ = 1641008978. Its totient is φ = 1641008976.

The previous prime is 1641008953. The next prime is 1641008987. The reversal of 1641008977 is 7798001461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1560566016 + 80442961 = 39504^2 + 8969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641008977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641008987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820504488 + 820504489.

It is an arithmetic number, because the mean of its divisors is an integer number (820504489).

Almost surely, 2^1641008977 is an apocalyptic number.

It is an amenable number.

1641008977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641008977 is an equidigital number, since it uses as much as digits as its factorization.

1641008977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 1641008977 is about 40509.3690027381. The cubic root of 1641008977 is about 1179.5154998882.

The spelling of 1641008977 in words is "one billion, six hundred forty-one million, eight thousand, nine hundred seventy-seven".