981927913 has 2 divisors, whose sum is σ = 981927914. Its totient is φ = 981927912.

The previous prime is 981927899. The next prime is 981927953. The reversal of 981927913 is 319729189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657819904 + 324108009 = 25648^2 + 18003^2 .

It is a cyclic number.

It is not a de Polignac number, because 981927913 - 2¹³ = 981919721 is a prime.

It is equal to p_49974664 and since 981927913 and 49974664 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (981927953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490963956 + 490963957.

It is an arithmetic number, because the mean of its divisors is an integer number (490963957).

Almost surely, 2^981927913 is an apocalyptic number.

It is an amenable number.

981927913 is a deficient number, since it is larger than the sum of its proper divisors (1).

981927913 is an equidigital number, since it uses as much as digits as its factorization.

981927913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 49.

The square root of 981927913 is about 31335.7290165715. The cubic root of 981927913 is about 993.9393132834.

The spelling of 981927913 in words is "nine hundred eighty-one million, nine hundred twenty-seven thousand, nine hundred thirteen".