8161557 has 8 divisors (see below), whose sum is σ = 11257440. Its totient is φ = 5253360.

The previous prime is 8161537. The next prime is 8161579. The reversal of 8161557 is 7551618.

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

It is not a de Polignac number, because 8161557 - 2⁶ = 8161493 is a prime.

It is a super-2 number, since 2×8161557² = 133222025328498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46819 + ... + 46992.

It is an arithmetic number, because the mean of its divisors is an integer number (1407180).

Almost surely, 2^8161557 is an apocalyptic number.

8161557 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

8161557 is a deficient number, since it is larger than the sum of its proper divisors (3095883).

8161557 is a wasteful number, since it uses less digits than its factorization.

8161557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93843.

The product of its digits is 8400, while the sum is 33.

The square root of 8161557 is about 2856.8438879295. The cubic root of 8161557 is about 201.3373459307.

The spelling of 8161557 in words is "eight million, one hundred sixty-one thousand, five hundred fifty-seven".