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61157 = 232659
BaseRepresentation
bin1110111011100101
310002220002
432323211
53424112
61151045
7343205
oct167345
9102802
1061157
1141a48
122b485
1321ab5
1418405
15131c2
hexeee5

61157 has 4 divisors (see below), whose sum is σ = 63840. Its totient is φ = 58476.

The previous prime is 61153. The next prime is 61169. The reversal of 61157 is 75116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61157 - 22 = 61153 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61151) 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 3 ways as a sum of consecutive naturals, for example, 1307 + ... + 1352.

It is an arithmetic number, because the mean of its divisors is an integer number (15960).

261157 is an apocalyptic number.

It is an amenable number.

61157 is a deficient number, since it is larger than the sum of its proper divisors (2683).

61157 is a wasteful number, since it uses less digits than its factorization.

61157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682.

The product of its digits is 210, while the sum is 20.

The square root of 61157 is about 247.2994136669. The cubic root of 61157 is about 39.3987150328.

The spelling of 61157 in words is "sixty-one thousand, one hundred fifty-seven".

Divisors: 1 23 2659 61157