1641947077 has 2 divisors, whose sum is σ = 1641947078. Its totient is φ = 1641947076.

The previous prime is 1641947063. The next prime is 1641947081. The reversal of 1641947077 is 7707491461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995465601 + 646481476 = 31551^2 + 25426^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641947077 - 2⁷ = 1641946949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641947477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820973538 + 820973539.

It is an arithmetic number, because the mean of its divisors is an integer number (820973539).

Almost surely, 2^1641947077 is an apocalyptic number.

It is an amenable number.

1641947077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641947077 is an equidigital number, since it uses as much as digits as its factorization.

1641947077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 1641947077 is about 40520.9461513425. The cubic root of 1641947077 is about 1179.7402178767.

The spelling of 1641947077 in words is "one billion, six hundred forty-one million, nine hundred forty-seven thousand, seventy-seven".