1031989961 has 2 divisors, whose sum is σ = 1031989962. Its totient is φ = 1031989960.

The previous prime is 1031989949. The next prime is 1031990039. The reversal of 1031989961 is 1699891301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 916212361 + 115777600 = 30269^2 + 10760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1031989961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1031982961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515994980 + 515994981.

It is an arithmetic number, because the mean of its divisors is an integer number (515994981).

Almost surely, 2^1031989961 is an apocalyptic number.

It is an amenable number.

1031989961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031989961 is an equidigital number, since it uses as much as digits as its factorization.

1031989961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 1031989961 is about 32124.6005578280. The cubic root of 1031989961 is about 1010.5515926351.

The spelling of 1031989961 in words is "one billion, thirty-one million, nine hundred eighty-nine thousand, nine hundred sixty-one".