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161290 = 251272
BaseRepresentation
bin100111011000001010
322012020201
4213120022
520130130
63242414
71241143
oct473012
9265221
10161290
111001a8
127940a
135854c
1442aca
1532bca
hex2760a

161290 has 12 divisors (see below), whose sum is σ = 292626. Its totient is φ = 64008.

The previous prime is 161281. The next prime is 161303. The reversal of 161290 is 92161.

It can be written as a sum of positive squares in only one way, i.e., 145161 + 16129 = 381^2 + 127^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1207 + ... + 1333.

2161290 is an apocalyptic number.

161290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161290 is a deficient number, since it is larger than the sum of its proper divisors (131336).

161290 is an equidigital number, since it uses as much as digits as its factorization.

161290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 161290 is about 401.6092628414. The cubic root of 161290 is about 54.4338619196.

The spelling of 161290 in words is "one hundred sixty-one thousand, two hundred ninety".

Divisors: 1 2 5 10 127 254 635 1270 16129 32258 80645 161290