1071581157 has 14 divisors (see below), whose sum is σ = 1606637862. Its totient is φ = 714386952.

The previous prime is 1071581149. The next prime is 1071581167. The reversal of 1071581157 is 7511851701.

1071581157 is a `hidden beast` number, since 1 + 0 + 71 + 581 + 1 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 853457796 + 218123361 = 29214^2 + 14769^2 .

It is not a de Polignac number, because 1071581157 - 2³ = 1071581149 is a prime.

It is a super-2 number, since 2×1071581157² = 2296572352074917298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1071581107) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 734238 + ... + 735695.

Almost surely, 2^1071581157 is an apocalyptic number.

It is an amenable number.

1071581157 is a deficient number, since it is larger than the sum of its proper divisors (535056705).

1071581157 is an frugal number, since it uses more digits than its factorization.

1071581157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469951 (or 1469936 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 36.

The square root of 1071581157 is about 32735.0142355246. The cubic root of 1071581157 is about 1023.3126812268.

The spelling of 1071581157 in words is "one billion, seventy-one million, five hundred eighty-one thousand, one hundred fifty-seven".