1157006581 has 8 divisors (see below), whose sum is σ = 1176799928. Its totient is φ = 1137240000.

The previous prime is 1157006549. The next prime is 1157006597. The reversal of 1157006581 is 1856007511.

It can be written as a sum of positive squares in 4 ways, for example, as 161036100 + 995970481 = 12690^2 + 31559^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1157006581 - 2⁵ = 1157006549 is a prime.

It is a super-2 number, since 2×1157006581² = 2677328456954619122, 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 (1157006531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93031 + ... + 104731.

It is an arithmetic number, because the mean of its divisors is an integer number (147099991).

Almost surely, 2^1157006581 is an apocalyptic number.

It is an amenable number.

1157006581 is a deficient number, since it is larger than the sum of its proper divisors (19793347).

1157006581 is a wasteful number, since it uses less digits than its factorization.

1157006581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13383.

The product of its (nonzero) digits is 8400, while the sum is 34.

The square root of 1157006581 is about 34014.7994408316. The cubic root of 1157006581 is about 1049.8129919410.

The spelling of 1157006581 in words is "one billion, one hundred fifty-seven million, six thousand, five hundred eighty-one".