1005705157 has 4 divisors (see below), whose sum is σ = 1024680780. Its totient is φ = 986729536.

The previous prime is 1005705143. The next prime is 1005705167. The reversal of 1005705157 is 7515075001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7515075001 = 7 ⋅1073582143.

It can be written as a sum of positive squares in 2 ways, for example, as 315382081 + 690323076 = 17759^2 + 26274^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005705157 - 2¹⁵ = 1005672389 is a prime.

It is a super-2 number, since 2×1005705157² = 2022885725632789298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005705137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9487732 + ... + 9487837.

It is an arithmetic number, because the mean of its divisors is an integer number (256170195).

Almost surely, 2^1005705157 is an apocalyptic number.

It is an amenable number.

1005705157 is a deficient number, since it is larger than the sum of its proper divisors (18975623).

1005705157 is an equidigital number, since it uses as much as digits as its factorization.

1005705157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18975622.

The product of its (nonzero) digits is 6125, while the sum is 31.

The square root of 1005705157 is about 31712.8547595451. The cubic root of 1005705157 is about 1001.8981138842.

The spelling of 1005705157 in words is "one billion, five million, seven hundred five thousand, one hundred fifty-seven".