1965920401 has 2 divisors, whose sum is σ = 1965920402. Its totient is φ = 1965920400.

The previous prime is 1965920389. The next prime is 1965920447. The reversal of 1965920401 is 1040295691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1658444176 + 307476225 = 40724^2 + 17535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1965920401 - 2²¹ = 1963823249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1965920461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982960200 + 982960201.

It is an arithmetic number, because the mean of its divisors is an integer number (982960201).

Almost surely, 2^1965920401 is an apocalyptic number.

It is an amenable number.

1965920401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965920401 is an equidigital number, since it uses as much as digits as its factorization.

1965920401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1965920401 is about 44338.7009394727. The cubic root of 1965920401 is about 1252.7237462012.

The spelling of 1965920401 in words is "one billion, nine hundred sixty-five million, nine hundred twenty thousand, four hundred one".