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139891 is a prime number
BaseRepresentation
bin100010001001110011
321002220011
4202021303
513434031
62555351
71121563
oct421163
9232804
10139891
1196114
1268b57
134b89b
1438da3
152b6b1
hex22273

139891 has 2 divisors, whose sum is σ = 139892. Its totient is φ = 139890.

The previous prime is 139883. The next prime is 139901. The reversal of 139891 is 198931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139891 - 23 = 139883 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (139801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69945 + 69946.

It is an arithmetic number, because the mean of its divisors is an integer number (69946).

2139891 is an apocalyptic number.

139891 is a deficient number, since it is larger than the sum of its proper divisors (1).

139891 is an equidigital number, since it uses as much as digits as its factorization.

139891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 139891 is about 374.0200529383. The cubic root of 139891 is about 51.9114617612.

The spelling of 139891 in words is "one hundred thirty-nine thousand, eight hundred ninety-one".