1961318386969 has 2 divisors, whose sum is σ = 1961318386970. Its totient is φ = 1961318386968.

The previous prime is 1961318386919. The next prime is 1961318387003. The reversal of 1961318386969 is 9696838131691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1878928147600 + 82390239369 = 1370740^2 + 287037^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961318386969 - 2¹⁵ = 1961318354201 is a prime.

It is a super-2 number, since 2×1961318386969² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1961318386898 and 1961318386907.

It is not a weakly prime, because it can be changed into another prime (1961318386919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980659193484 + 980659193485.

It is an arithmetic number, because the mean of its divisors is an integer number (980659193485).

Almost surely, 2^{1961318386969} is an apocalyptic number.

It is an amenable number.

1961318386969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961318386969 is an equidigital number, since it uses as much as digits as its factorization.

1961318386969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90699264, while the sum is 70.

The spelling of 1961318386969 in words is "one trillion, nine hundred sixty-one billion, three hundred eighteen million, three hundred eighty-six thousand, nine hundred sixty-nine".