1961129237 has 2 divisors, whose sum is σ = 1961129238. Its totient is φ = 1961129236.

The previous prime is 1961129153. The next prime is 1961129239. The reversal of 1961129237 is 7329211691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1068374596 + 892754641 = 32686^2 + 29879^2 .

It is an emirp because it is prime and its reverse (7329211691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1961129237 - 2¹² = 1961125141 is a prime.

Together with 1961129239, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1961129194 and 1961129203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961129239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980564618 + 980564619.

It is an arithmetic number, because the mean of its divisors is an integer number (980564619).

Almost surely, 2^1961129237 is an apocalyptic number.

It is an amenable number.

1961129237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961129237 is an equidigital number, since it uses as much as digits as its factorization.

1961129237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 1961129237 is about 44284.6388378634. The cubic root of 1961129237 is about 1251.7052432186.

The spelling of 1961129237 in words is "one billion, nine hundred sixty-one million, one hundred twenty-nine thousand, two hundred thirty-seven".