1961814493 has 2 divisors, whose sum is σ = 1961814494. Its totient is φ = 1961814492.

The previous prime is 1961814457. The next prime is 1961814497. The reversal of 1961814493 is 3944181691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1707507684 + 254306809 = 41322^2 + 15947^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961814493 - 2¹⁷ = 1961683421 is a prime.

It is a super-2 number, since 2×1961814493² = 7697432209889694098, which contains 22 as substring.

It is a congruent number.

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, 980907246 + 980907247.

It is an arithmetic number, because the mean of its divisors is an integer number (980907247).

Almost surely, 2^1961814493 is an apocalyptic number.

It is an amenable number.

1961814493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961814493 is an equidigital number, since it uses as much as digits as its factorization.

1961814493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 1961814493 is about 44292.3751112988. The cubic root of 1961814493 is about 1251.8510161451.

The spelling of 1961814493 in words is "one billion, nine hundred sixty-one million, eight hundred fourteen thousand, four hundred ninety-three".