961420991 has 2 divisors, whose sum is σ = 961420992. Its totient is φ = 961420990.

The previous prime is 961420981. The next prime is 961421039. The reversal of 961420991 is 199024169.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 961420991 - 2²² = 957226687 is a prime.

It is equal to p_48984215 and since 961420991 and 48984215 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961420981) 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, 480710495 + 480710496.

It is an arithmetic number, because the mean of its divisors is an integer number (480710496).

Almost surely, 2^961420991 is an apocalyptic number.

961420991 is a deficient number, since it is larger than the sum of its proper divisors (1).

961420991 is an equidigital number, since it uses as much as digits as its factorization.

961420991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 961420991 is about 31006.7894339288. The cubic root of 961420991 is about 986.9713210489.

The spelling of 961420991 in words is "nine hundred sixty-one million, four hundred twenty thousand, nine hundred ninety-one".