1961313503 has 2 divisors, whose sum is σ = 1961313504. Its totient is φ = 1961313502.

The previous prime is 1961313499. The next prime is 1961313527. The reversal of 1961313503 is 3053131691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1961313503 - 2² = 1961313499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1961313503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961313533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980656751 + 980656752.

It is an arithmetic number, because the mean of its divisors is an integer number (980656752).

Almost surely, 2^1961313503 is an apocalyptic number.

1961313503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961313503 is an equidigital number, since it uses as much as digits as its factorization.

1961313503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 1961313503 is about 44286.7192620993. The cubic root of 1961313503 is about 1251.7444450367.

The spelling of 1961313503 in words is "one billion, nine hundred sixty-one million, three hundred thirteen thousand, five hundred three".