1961129153 has 2 divisors, whose sum is σ = 1961129154. Its totient is φ = 1961129152.

The previous prime is 1961129141. The next prime is 1961129237. The reversal of 1961129153 is 3519211691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1949487409 + 11641744 = 44153^2 + 3412^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961129153 - 2¹⁰ = 1961128129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1961129353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980564576 + 980564577.

It is an arithmetic number, because the mean of its divisors is an integer number (980564577).

Almost surely, 2^1961129153 is an apocalyptic number.

It is an amenable number.

1961129153 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961129153 is an equidigital number, since it uses as much as digits as its factorization.

1961129153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 38.

The square root of 1961129153 is about 44284.6378894533. The cubic root of 1961129153 is about 1251.7052253474.

The spelling of 1961129153 in words is "one billion, nine hundred sixty-one million, one hundred twenty-nine thousand, one hundred fifty-three".