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85831213 = 1322983211
BaseRepresentation
bin1010001110110…
…10111000101101
312222111200021211
411013122320231
5133433044323
612303354421
72061360526
oct507327055
9188450254
1085831213
11444a4296
12248b2a11
1314a22600
14b58384d
15780670d
hex51dae2d

85831213 has 24 divisors (see below), whose sum is σ = 97765920. Its totient is φ = 75216960.

The previous prime is 85831201. The next prime is 85831217. The reversal of 85831213 is 31213858.

It is not a de Polignac number, because 85831213 - 217 = 85700141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85831217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 406678 + ... + 406888.

It is an arithmetic number, because the mean of its divisors is an integer number (4073580).

Almost surely, 285831213 is an apocalyptic number.

85831213 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

It is an amenable number.

85831213 is a deficient number, since it is larger than the sum of its proper divisors (11934707).

85831213 is a wasteful number, since it uses less digits than its factorization.

85831213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 336 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 85831213 is about 9264.5136407693. The cubic root of 85831213 is about 441.1115370993. Note that the first 3 decimals are identical.

The spelling of 85831213 in words is "eighty-five million, eight hundred thirty-one thousand, two hundred thirteen".

Divisors: 1 13 29 83 169 211 377 1079 2407 2743 4901 6119 14027 17513 31291 35659 79547 227669 406783 507877 1034111 2959697 6602401 85831213