961505971 has 2 divisors, whose sum is σ = 961505972. Its totient is φ = 961505970.

The previous prime is 961505969. The next prime is 961505981. The reversal of 961505971 is 179505169.

It is a weak prime.

It is an emirp because it is prime and its reverse (179505169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961505971 - 2¹ = 961505969 is a prime.

Together with 961505969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (961505921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480752985 + 480752986.

It is an arithmetic number, because the mean of its divisors is an integer number (480752986).

Almost surely, 2^961505971 is an apocalyptic number.

961505971 is a deficient number, since it is larger than the sum of its proper divisors (1).

961505971 is an equidigital number, since it uses as much as digits as its factorization.

961505971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 85050, while the sum is 43.

The square root of 961505971 is about 31008.1597486855. The cubic root of 961505971 is about 987.0003996567. Note that the first 3 decimals are identical.

The spelling of 961505971 in words is "nine hundred sixty-one million, five hundred five thousand, nine hundred seventy-one".