161154857 has 4 divisors (see below), whose sum is σ = 161858820. Its totient is φ = 160450896.

The previous prime is 161154839. The next prime is 161154871. The reversal of 161154857 is 758451161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758451161 = 13 ⋅58342397.

It can be written as a sum of positive squares in 2 ways, for example, as 96255721 + 64899136 = 9811^2 + 8056^2 .

It is a cyclic number.

It is not a de Polignac number, because 161154857 - 2⁸ = 161154601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161154857.

It is not an unprimeable number, because it can be changed into a prime (161154457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351638 + ... + 352095.

It is an arithmetic number, because the mean of its divisors is an integer number (40464705).

Almost surely, 2^161154857 is an apocalyptic number.

It is an amenable number.

161154857 is a deficient number, since it is larger than the sum of its proper divisors (703963).

161154857 is an equidigital number, since it uses as much as digits as its factorization.

161154857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703962.

The product of its digits is 33600, while the sum is 38.

The square root of 161154857 is about 12694.6782944665. The cubic root of 161154857 is about 544.1865450654.

The spelling of 161154857 in words is "one hundred sixty-one million, one hundred fifty-four thousand, eight hundred fifty-seven".