1961313547 has 2 divisors, whose sum is σ = 1961313548. Its totient is φ = 1961313546.

The previous prime is 1961313533. The next prime is 1961313583. The reversal of 1961313547 is 7453131691.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961313547 is a prime.

It is not a weakly prime, because it can be changed into another prime (1961313527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980656773 + 980656774.

It is an arithmetic number, because the mean of its divisors is an integer number (980656774).

Almost surely, 2^1961313547 is an apocalyptic number.

1961313547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961313547 is an equidigital number, since it uses as much as digits as its factorization.

1961313547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 1961313547 is about 44286.7197588622. The cubic root of 1961313547 is about 1251.7444543973.

The spelling of 1961313547 in words is "one billion, nine hundred sixty-one million, three hundred thirteen thousand, five hundred forty-seven".