981354251 has 2 divisors, whose sum is σ = 981354252. Its totient is φ = 981354250.

The previous prime is 981354217. The next prime is 981354277. The reversal of 981354251 is 152453189.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 981354251 - 2¹⁰ = 981353227 is a prime.

It is not a weakly prime, because it can be changed into another prime (981344251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490677125 + 490677126.

It is an arithmetic number, because the mean of its divisors is an integer number (490677126).

Almost surely, 2^981354251 is an apocalyptic number.

981354251 is a deficient number, since it is larger than the sum of its proper divisors (1).

981354251 is an equidigital number, since it uses as much as digits as its factorization.

981354251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 38.

The square root of 981354251 is about 31326.5741982745. The cubic root of 981354251 is about 993.7457158103.

The spelling of 981354251 in words is "nine hundred eighty-one million, three hundred fifty-four thousand, two hundred fifty-one".