981523157 has 2 divisors, whose sum is σ = 981523158. Its totient is φ = 981523156.

The previous prime is 981523141. The next prime is 981523163. The reversal of 981523157 is 751325189.

981523157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 961372036 + 20151121 = 31006^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 981523157 - 2⁴ = 981523141 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981523177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490761578 + 490761579.

It is an arithmetic number, because the mean of its divisors is an integer number (490761579).

Almost surely, 2^981523157 is an apocalyptic number.

It is an amenable number.

981523157 is a deficient number, since it is larger than the sum of its proper divisors (1).

981523157 is an equidigital number, since it uses as much as digits as its factorization.

981523157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 41.

The square root of 981523157 is about 31329.2699723438. The cubic root of 981523157 is about 993.8027254595.

The spelling of 981523157 in words is "nine hundred eighty-one million, five hundred twenty-three thousand, one hundred fifty-seven".