971661287 has 2 divisors, whose sum is σ = 971661288. Its totient is φ = 971661286.

The previous prime is 971661259. The next prime is 971661323. The reversal of 971661287 is 782166179.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-971661287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971661217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485830643 + 485830644.

It is an arithmetic number, because the mean of its divisors is an integer number (485830644).

Almost surely, 2^971661287 is an apocalyptic number.

971661287 is a deficient number, since it is larger than the sum of its proper divisors (1).

971661287 is an equidigital number, since it uses as much as digits as its factorization.

971661287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 971661287 is about 31171.4819506548. The cubic root of 971661287 is about 990.4630989873.

The spelling of 971661287 in words is "nine hundred seventy-one million, six hundred sixty-one thousand, two hundred eighty-seven".