1965187949 has 2 divisors, whose sum is σ = 1965187950. Its totient is φ = 1965187948.

The previous prime is 1965187943. The next prime is 1965187979. The reversal of 1965187949 is 9497815691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1615236100 + 349951849 = 40190^2 + 18707^2 .

It is a cyclic number.

It is not a de Polignac number, because 1965187949 - 2¹² = 1965183853 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1965187943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982593974 + 982593975.

It is an arithmetic number, because the mean of its divisors is an integer number (982593975).

Almost surely, 2^1965187949 is an apocalyptic number.

It is an amenable number.

1965187949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965187949 is an equidigital number, since it uses as much as digits as its factorization.

1965187949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 59.

The square root of 1965187949 is about 44330.4404331832. The cubic root of 1965187949 is about 1252.5681491943.

The spelling of 1965187949 in words is "one billion, nine hundred sixty-five million, one hundred eighty-seven thousand, nine hundred forty-nine".