1961129 has 2 divisors, whose sum is σ = 1961130. Its totient is φ = 1961128.

The previous prime is 1961107. The next prime is 1961131. The reversal of 1961129 is 9211691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1827904 + 133225 = 1352^2 + 365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961129 is a prime.

Together with 1961131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1961329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980564 + 980565.

It is an arithmetic number, because the mean of its divisors is an integer number (980565).

2^1961129 is an apocalyptic number.

It is an amenable number.

1961129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961129 is an equidigital number, since it uses as much as digits as its factorization.

1961129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 29.

The square root of 1961129 is about 1400.4031562375. The cubic root of 1961129 is about 125.1705192796.

The spelling of 1961129 in words is "one million, nine hundred sixty-one thousand, one hundred twenty-nine".