961672981 has 2 divisors, whose sum is σ = 961672982. Its totient is φ = 961672980.

The previous prime is 961672951. The next prime is 961672997. The reversal of 961672981 is 189276169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 960070225 + 1602756 = 30985^2 + 1266^2 .

It is an emirp because it is prime and its reverse (189276169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961672981 - 2⁹ = 961672469 is a prime.

It is a super-2 number, since 2×961672981² = 1849629844770852722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961672951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480836490 + 480836491.

It is an arithmetic number, because the mean of its divisors is an integer number (480836491).

Almost surely, 2^961672981 is an apocalyptic number.

It is an amenable number.

961672981 is a deficient number, since it is larger than the sum of its proper divisors (1).

961672981 is an equidigital number, since it uses as much as digits as its factorization.

961672981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 961672981 is about 31010.8526325865. The cubic root of 961672981 is about 987.0575424441.

The spelling of 961672981 in words is "nine hundred sixty-one million, six hundred seventy-two thousand, nine hundred eighty-one".