981951013 has 2 divisors, whose sum is σ = 981951014. Its totient is φ = 981951012.

The previous prime is 981951007. The next prime is 981951017. The reversal of 981951013 is 310159189.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518108644 + 463842369 = 22762^2 + 21537^2 .

It is a cyclic number.

It is not a de Polignac number, because 981951013 - 2²⁹ = 445080101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981951017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490975506 + 490975507.

It is an arithmetic number, because the mean of its divisors is an integer number (490975507).

Almost surely, 2^981951013 is an apocalyptic number.

It is an amenable number.

981951013 is a deficient number, since it is larger than the sum of its proper divisors (1).

981951013 is an equidigital number, since it uses as much as digits as its factorization.

981951013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 37.

The square root of 981951013 is about 31336.0976032435. The cubic root of 981951013 is about 993.9471074123.

The spelling of 981951013 in words is "nine hundred eighty-one million, nine hundred fifty-one thousand, thirteen".