981646157 has 2 divisors, whose sum is σ = 981646158. Its totient is φ = 981646156.

The previous prime is 981646129. The next prime is 981646199. The reversal of 981646157 is 751646189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 548215396 + 433430761 = 23414^2 + 20819^2 .

It is a cyclic number.

It is not a de Polignac number, because 981646157 - 2¹⁸ = 981384013 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 (981646357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490823078 + 490823079.

It is an arithmetic number, because the mean of its divisors is an integer number (490823079).

Almost surely, 2^981646157 is an apocalyptic number.

It is an amenable number.

981646157 is a deficient number, since it is larger than the sum of its proper divisors (1).

981646157 is an equidigital number, since it uses as much as digits as its factorization.

981646157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 981646157 is about 31331.2329313738. The cubic root of 981646157 is about 993.8442366654.

The spelling of 981646157 in words is "nine hundred eighty-one million, six hundred forty-six thousand, one hundred fifty-seven".