1947339161 has 2 divisors, whose sum is σ = 1947339162. Its totient is φ = 1947339160.

The previous prime is 1947339101. The next prime is 1947339169. The reversal of 1947339161 is 1619337491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1743563536 + 203775625 = 41756^2 + 14275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1947339161 - 2¹⁴ = 1947322777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1947339169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 973669580 + 973669581.

It is an arithmetic number, because the mean of its divisors is an integer number (973669581).

Almost surely, 2^1947339161 is an apocalyptic number.

It is an amenable number.

1947339161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1947339161 is an equidigital number, since it uses as much as digits as its factorization.

1947339161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 44.

The square root of 1947339161 is about 44128.6659780239. The cubic root of 1947339161 is about 1248.7644668486.

The spelling of 1947339161 in words is "one billion, nine hundred forty-seven million, three hundred thirty-nine thousand, one hundred sixty-one".