1961814457 has 2 divisors, whose sum is σ = 1961814458. Its totient is φ = 1961814456.

The previous prime is 1961814431. The next prime is 1961814493. The reversal of 1961814457 is 7544181691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1725239296 + 236575161 = 41536^2 + 15381^2 .

It is an emirp because it is prime and its reverse (7544181691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1961814457 - 2²³ = 1953425849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1961814497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980907228 + 980907229.

It is an arithmetic number, because the mean of its divisors is an integer number (980907229).

Almost surely, 2^1961814457 is an apocalyptic number.

It is an amenable number.

1961814457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961814457 is an equidigital number, since it uses as much as digits as its factorization.

1961814457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 46.

The square root of 1961814457 is about 44292.3747049083. The cubic root of 1961814457 is about 1251.8510084878.

The spelling of 1961814457 in words is "one billion, nine hundred sixty-one million, eight hundred fourteen thousand, four hundred fifty-seven".