981875551 has 2 divisors, whose sum is σ = 981875552. Its totient is φ = 981875550.

The previous prime is 981875491. The next prime is 981875569. The reversal of 981875551 is 155578189.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 981875551 - 2¹⁵ = 981842783 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 981875495 and 981875504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981875051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490937775 + 490937776.

It is an arithmetic number, because the mean of its divisors is an integer number (490937776).

Almost surely, 2^981875551 is an apocalyptic number.

981875551 is a deficient number, since it is larger than the sum of its proper divisors (1).

981875551 is an equidigital number, since it uses as much as digits as its factorization.

981875551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504000, while the sum is 49.

The square root of 981875551 is about 31334.8935054836. The cubic root of 981875551 is about 993.9216454639.

The spelling of 981875551 in words is "nine hundred eighty-one million, eight hundred seventy-five thousand, five hundred fifty-one".