1161331057 has 8 divisors (see below), whose sum is σ = 1194985440. Its totient is φ = 1127978880.

The previous prime is 1161331051. The next prime is 1161331069. The reversal of 1161331057 is 7501331611.

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 1161331057 - 2³ = 1161331049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161331051) 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, 67744 + ... + 83137.

It is an arithmetic number, because the mean of its divisors is an integer number (149373180).

Almost surely, 2^1161331057 is an apocalyptic number.

It is an amenable number.

1161331057 is a deficient number, since it is larger than the sum of its proper divisors (33654383).

1161331057 is a wasteful number, since it uses less digits than its factorization.

1161331057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151103.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 1161331057 is about 34078.3077191342. The cubic root of 1161331057 is about 1051.1193073691.

Adding to 1161331057 its reverse (7501331611), we get a palindrome (8662662668).

The spelling of 1161331057 in words is "one billion, one hundred sixty-one million, three hundred thirty-one thousand, fifty-seven".