1982169157 has 2 divisors, whose sum is σ = 1982169158. Its totient is φ = 1982169156.

The previous prime is 1982169131. The next prime is 1982169239. The reversal of 1982169157 is 7519612891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1500322756 + 481846401 = 38734^2 + 21951^2 .

It is a cyclic number.

It is not a de Polignac number, because 1982169157 - 2⁷ = 1982169029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1982169157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1982169457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991084578 + 991084579.

It is an arithmetic number, because the mean of its divisors is an integer number (991084579).

Almost surely, 2^1982169157 is an apocalyptic number.

It is an amenable number.

1982169157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982169157 is an equidigital number, since it uses as much as digits as its factorization.

1982169157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 49.

The square root of 1982169157 is about 44521.5583397527. The cubic root of 1982169157 is about 1256.1656248802.

The spelling of 1982169157 in words is "one billion, nine hundred eighty-two million, one hundred sixty-nine thousand, one hundred fifty-seven".