1961284729 has 2 divisors, whose sum is σ = 1961284730. Its totient is φ = 1961284728.

The previous prime is 1961284711. The next prime is 1961284753. The reversal of 1961284729 is 9274821691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1748912400 + 212372329 = 41820^2 + 14573^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961284729 - 2⁷ = 1961284601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1961284799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980642364 + 980642365.

It is an arithmetic number, because the mean of its divisors is an integer number (980642365).

Almost surely, 2^1961284729 is an apocalyptic number.

It is an amenable number.

1961284729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961284729 is an equidigital number, since it uses as much as digits as its factorization.

1961284729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 49.

The square root of 1961284729 is about 44286.3944005380. The cubic root of 1961284729 is about 1251.7383236508.

The spelling of 1961284729 in words is "one billion, nine hundred sixty-one million, two hundred eighty-four thousand, seven hundred twenty-nine".