1161001557 has 12 divisors (see below), whose sum is σ = 1682931744. Its totient is φ = 771264360.

The previous prime is 1161001549. The next prime is 1161001559. The reversal of 1161001557 is 7551001611.

It is a happy number.

1161001557 is a `hidden beast` number, since 1 + 1 + 6 + 100 + 1 + 557 = 666.

It is not a de Polignac number, because 1161001557 - 2³ = 1161001549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1161001557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161001559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225369 + ... + 230462.

It is an arithmetic number, because the mean of its divisors is an integer number (140244312).

Almost surely, 2^1161001557 is an apocalyptic number.

It is an amenable number.

1161001557 is a deficient number, since it is larger than the sum of its proper divisors (521930187).

1161001557 is a wasteful number, since it uses less digits than its factorization.

1161001557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456120 (or 456117 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 27.

The square root of 1161001557 is about 34073.4729224950. The cubic root of 1161001557 is about 1051.0198879514.

The spelling of 1161001557 in words is "one billion, one hundred sixty-one million, one thousand, five hundred fifty-seven".